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Insulation keeps your home cool and saves energy. What areas of your home need insulation the most? Find out in this guide.
Garbage disposal troubles? Click here to find out how to troubleshoot your garbage disposal on your own and when it's time to call in the pros.
A ductless air conditioning system cools your space without the need for traditional ductwork. But how does ductless AC work? Find out here.
Are you looking for insulation services to make your home more energy efficient? See our guide about how to better insulate your home to learn more.
Are you constantly wondering why your toilet keeps clogging? Read this guide to find out the possible answers and how to fix the issue.
Stop guessing and start enjoying the perfect indoor temperature. Learn the best temperature to set AC unit and maximize your comfort and savings.
When is monsoon season in Arizona? Click here to find out more about monsoon season in Arizona and learn how you can prepare your home.
For comfort and savings, you need the right size AC unit. Learn how to pick the right unit for you and your home here.
Before a minor drip causes costly damage, learn how to detect a water leak and simple solutions to fix it.
"Does reverse osmosis remove PFAS?" Not all at-home water filters remove toxic PFAS from your drinking water, keep reading to learn as we explore this question.
Do I need a permit to remodel my garage? It's a smart move on your part to ask this question before getting into trouble. Here's what you should know.
What's the easiest way to unclog a blocked shower drain in your home? See our guide as we look at how to unclog a shower drain today.
Unlike the classic: ‘Is your fridge running? Cause you better go catch it!’ Water heater leaks are no joke. There are a lot of reasons your water heater may be leaking. Learn the most common answers here.
Is your AC unit acting up and not blowing cold air? Don't sweat it! Dive into our article for quick fixes and professional solutions.
Discover the secret to purer, healthier water at home. Dive into our blog to learn about reverse osmosis systems. Your health will thank you!
Curious about the consequences of a clogged AC drain? Click here to discover the potential dangers and how to prevent them.
A soft buzz can be expected from an ac unit, but if your AC is making a loud noise there could be a problem. What is your AC trying to tell you? Learn more!
Ready to make the most of your water heater? Click here to read the full article and unlock the secrets to maximizing its lifespan.
Have you been delaying your water heater’s maintenance? Flushing and draining are critical to your water heater’s lifespan. Find out how often you should be performing this regular maintenance here.
Ah Choo! Is that your air conditioner making you sneeze? Let’s discuss more about your AC Unit's impact on your health.
Plumbing problems are inevitable when you own a home, but when are they emergencies? Here are the top plumbing emergencies that require professional plumbing right away!
As the Phoenix sun starts to sizzle, are you finding it harder to keep your home cool and comfy? Believe it or not, your old thermostat could be the sneaky culprit.
Are you ready for a behind-the-scenes look into an HVAC technician's toolkit?
Today, we'll explore how a whole-home air purifier can help you breathe easier in your home. So get ready for a breathtaking adventure with Parker & Sons!
It’s time to break out the cleaning supplies and dive into our annual spring cleaning rituals.
Summer is just around the corner, and the inevitable dry Phoenix heat comes with it. But don't sweat it! At Parker & Sons, we have some tips to keep you cool.
Hoping for a little extra cash as a tax refund? Hold on to your hats, folks, because we have exciting news for you!
Spring has finally arrived in Arizona, and it's the perfect time to think about the unused space in your garage!
Keep your heating and cooling system in tip-top shape so you can stay comfortable all year round!
We’re taking a page from Buzzfeed … a “love quiz” about your furnace, just in time for Valentine’s Day! Are you concerned that your furnace may not show you the love it should?
Reversed faucets are a common occurrence in many homes and businesses. It can be a frustrating problem and can seem like a daunting task to fix.
A study projects hundreds of thousands of tradespeople are needed in Arizona within the next few years. Could one of them be you?
The heating systems of the distant future are expected to be more efficient and automated than ever before.
Happy holidays! As we head into winter, Parker & Sons is here to help with lots and lots of warming tips.
Many popular HFC refrigerants, such as R410A, are set to become obsolete by 2047!
As you may have already heard, two new regulations affecting home heating and cooling are coming soon ...
Did you know plants can help improve indoor air quality? They make oxygen and absorb toxins – and our homes are more toxic than you think!
Movies and TV shows often depict characters crawling through air vents to escape danger or access a hidden area. But is this possible?
Especially if you have an older home, it's possible that components of your A/C unit are cobbled together from different brands. So what?
Honestly, we love explaining the parts of an air conditioner to our customers. So let's start with the most important: the condenser!
How often do you shower? Whatever your frequency, we're willing to bet that at least once during your showers you've had to deal with a clog.
This one is sure to get your attention! Bugs could be getting into your home through ducts and vents. Read on to learn how to prevent this:
Did you know that dry air in your home can affect your health? And since humidity is low here in Phoenix, you should pay extra careful attention!
Solar thermal panels are a great way to harvest the sun's energy and use it to heat your home. So, is the season of love the right season to consider solar?
Nothing is worse than a leaky showerhead! Well, we can think of a few worse things, like the higher bills it causes. Here's how to fix it:
Many people's New Year's resolution is to take better care of the environment. Could futuristic hydrogen-powered boilers make that easier?
This holiday season we know you're looking forward to celebrating with friends and family, but we want to make sure it's a safe celebration.
It's always important to have a comfortable and well-ventilated home, but this is especially true when your guests depend on you!
Where would we be without Alice Parker? We would be a lot colder! Today, let's talk about the history of home heating.
Did you know that heating appliances are the second-highest cause of house fires? Stay safe as you turn on your heat this year!
“Can you give me an estimate of how much a new air conditioner would cost over the phone?” Fair question. And the answer is NO.
As the heat blazes on here in The Valley, there's nothing more important than an efficient A/C system. Does yours pass the test? Find out:
You know your AC helps keep you cool, but there's a wristwatch that claims to be a "portable AC watch." Is this possible?
The next innovation in the HVAC industry is ... paper? Learn more about how an everyday material could soon be cooling down YOUR home.
In July, you're used to hearing loud noises! But they probably shouldn't be coming from your AC unit. Let us help you out:
Have you heard of "A/C Appreciation Day"? It's July 3rd of every year. We'd like to celebrate by telling the story of the history of A/C ...
Is low water pressure a sign of an impending plumbing emergency? Find out with the help of our team at Parker & Sons:
We know a lot about the people across the pond – when it comes to Harry and Meghan. Did you know that only 0.5% of homes in the UK have AC?
You might think you already know what never to put down your drain, but 99% of homeowners don't know ALL of what we're about to tell you!
How many years before a water heater needs to be replaced? What are the tell-tale signs? We answer these questions and more for you.
You know Elon Musk as the founder of Tesla and SpaceX. We're wondering... Is the HVAC industry next for Elon?
You've seen the ads: power-saving devices that plug into your wall and claim to be able to cut your electricity bills in HALF!
Did you see sudden spikes in your bill last winter? Now that winter is over, we want to help you reflect so this doesn't happen again!
Usually "getting audited" is a bad thing... But in the case of an energy audit, it will help you save money!
We made some very special HVAC-themed candy hearts, just in time for Valentine's Day. Take a look!
If you follow our technicians page on Instagram, you know exactly how much fun being a Parker & Sons tech is! Is it right for YOU?
Jingle bells, furnace smells .. robin laid an egg? Surprisingly, it's actually not uncommon to have a furnace that smells like rotten eggs.
If you have a deserving teen who's college bound, read about how you can submit him/her for consideration.
Can you "hack" your thermostat to save money? Today, we are here to give you top thermostat tips.
We know it's not polite to toot your own horn ... but we thought we should explain why "We're Not Your Average Joe”!
It's pretty easy to spot obvious water leaks in your home, but what about dreaded HIDDEN leaks? Today we'll tell you how to find them.
Curious about the cost of a new air conditioner? Why is it so difficult to get someone to provide actual equipment and installation NUMBERS?
We love Lennox! Why should you consider Lennox HVAC products above any others? We're here to explain the benefits and features.
Right now, many people are worried about being able to pay their electric bills. We have suggestions and resources to help!
You know that your air conditioner DOES work (or if it doesn't, that's something we'd be glad to help you out with!) But HOW exactly does an A/C work?
Just like how UV light purifies the air in nature, Captura can help you purify the air in your home, with the same technology hospitals rely on!
So your HVAC system is usually pretty "go with the flow," but right now, your problem is low air flow! So then, what do you do?
We believe in taking care of our customers and our team members. This is particularly true as we take steps to prevent the spread of the coronavirus (COVID-19).
From Alexa to home security systems, a smart home is more within our reach than ever before. Are the benefits worth the rather significant costs?
The history of electricity is pretty shocking! Today, we thought we'd talk about how your home is powered. It's pretty electrifying stuff.
It's almost Valentine's Day, and we love you! That’s why we’ve created a list of the Top 3 energy hogs so you can save $100s per year.
Copper has been the material of choice by many since the 1960s, but are copper pipes the best for your home?
You've probably seen the tip over and over again that you should "seal air leaks and cracks around your home," but how exactly do you do that in winter?
Every holiday season in the U.S., 15,000 people are injured putting up decorations! Here are our holiday light safety tips so you avoid that RISK...
If you have a scratchy throat, headaches, and are tired all the time, it's possible that germs in your home are making you sick. The Air Scrubber can help!
A heat pump can often be a noisy system. When is your unit just being loud, and when does the noise indicate a bigger problem?
Creaking and banging noises might be a little scarier around Halloween time. They could just be harmless or a major problem. Here’s how to know the difference.
With blown-in insulation, you'll end up saving money, not spending it!
Living in Arizona comes with challenges when it comes to cooling your home. What should you do about rooms that aren’t attached to the central AC?
The air ducts in your home are like the veins and arteries in your body, they help transport clean air throughout your home. Making sure that your ducts are in tip-top shape is important.
Choosing a new air conditioning unit can be a bit overwhelming. To help, we've put together this list of answers to common questions.
If you have warm air coming out when you turn on your AC unit, it could be caused by a few simple issues that you can correct on your own.
Fatigue, itchy throats, headache, and dizziness are immediate symptoms of poor indoor air quality (IAQ).
While you’re clearing the dishes and wrapping up your Thanksgiving Day dinner, be sure to be careful how many leftovers you scrape down the drain.
Out here in the desert, it’s not uncommon to find animals, such as lizards, scorpions or snakes in your AC system.
October is National Fire Safety month, and it’s a good time to be reminded of the importance of electrical safety around your home.
Drip, drip, drip…That’s the sound of money going down the drain! When you have a plumbing leak, you’re paying for water you are not using.
Here in Arizona, we experience more severe weather than many other states. This time of year, monsoon season is our biggest threat.
If you’re working through your spring and summer cleaning checklist, make sure to add drain cleaning to your list.
When you need to replace the air conditioning system in your Phoenix or Tucson area home, you may want to consider replacing both with a heat pump.
Our hot, dry weather can affect your pipes and plumbing system, which could potentially go unnoticed.
Because air conditioners, furnaces, and heat pumps represent sizeable investments, it’s good to consider all angles before making a decision.
Just like a routine oil change or 10,000-mile tune-up for your car, maintenance is necessary to keep your home’s HVAC system running at peak performance.
Selecting the right thermostat is easier once you match the right features to your unique needs and lifestyle.
Hard water is annoying, but it’s hard to decide which system is best. What’s the difference between softening and filtration, and which one is better?
Other parts of the country are at risk of their pipes busting because of freezing temperatures, but there are other things that cause pipes to burst.
During this time of year, it’s especially important to implement the electrical safety tips that you’ve come to know when putting up holiday lights.
October is Fire Prevention Month, and Parker and Sons is offering a whole home electrical safety inspection with a panel tune-up.
When summer comes, everyone loves being outside. However, because temperatures get so high, it’s difficult to enjoy the season on your patio because of...
A clogged, overflowing toilet is a nightmare we have all had to deal with at some point. Doesn’t it always seem to happen at the absolute worst possible time too?
You can fill your yard or gardens with local plants that have a role in the native ecosystem, don’t require too much water or what have you.
Locally, the irrigation system is mostly provided by SRP. It is flood irrigation, which distributes water from the watershed areas to larger neighborhood systems.
We've got the fix for anything that ails your systems, but as the saying goes, an ounce of prevention is worth a pound of cure.
Water heaters... How long should they really last? When is too soon/too late to replace them? What can you do to extend their life and get the most out of them?
Even though you’ve seen this done on television for your entire life, it’s not safe or smart to hide anything in those vents. Here’s why…
In ancient times, human settlements and civilizations could only develop nearby naturally occurring water sources. The development of systems to gather water and divert them to large communities allowed for the spread of humanity.
Ah, the garbage disposal system. Placed strategically right next to your sink for easy access and even easier use. If you have one, you know it’s not like your regular garbage can at all!
How do you know if your water softener is working? Even if it has enough salt in it, is it really working? What are some signs of it not working?
It’s true. You don’t need to hire a professional for everything. In fact, many people can fix a few broken items around the house with extra assistance needed!
Toilets. They may not be glorious, but boy do we all depend on them on a daily basis. Just imagine what life would be like without them.
Last time on the Parker & Sons blog, we went over some keys to a successful DIY plumbing job. With those keys in mind and a well outfitted toolbox let’s take a look at several fixes you can tackle yourself.
Plumbing is not the easiest DIY home project. When it comes to working with water, it is helpful to have a handle on some things first.
While the plunger may be the first line of defense in any plumbing emergency, it might surprise you that there is a variety of tools that may be needed for the job.
In Maricopa county, here's what you need to know... daily burn restrictions, what is prohibited to burn, indoor burn options, and outdoor burn permitting.
Drywall is panel composed of calcium sulfate dihydrate, known outside the scientific community as gypsum. The precursor to drywall, plasterboard, first appeared in the United Kingdom in the late 1800s.
A toilet by any other name still gets the job done, but it may be a very different experience. Check out some of these ingenious and shocking types of toilets.
Home maintenance can feel like a constant battle. Plumbing problems sneak up, HVAC units break down, and general cleaning issues never seem to end. Homeowners need all the help they can get.
Whether it's the toilet, shower, or sink, clogs are always unpleasant to handle. It's easier though when you have the right tool to get the job done as fast as possible.
The world of plumbing changes more than your probably realize. In fact, plumbing is a fast-paced, hot blooded, running for the hills type profession similar in nature to firefighting, stunt work, drag racing, fighter piloting and professional sky diving.
We're paying respect to unexpected plumbers who've graced our profession. In this installment, we're introducing you to a dancing lord and a legendary actor.
In this installment, we're paying respect to a plumber who's made using the toilet a better experience and changed how we talk about the business we all do.
We're paying respect to unexpected plumbers who've graced our profession. In this installment, we're introducing you to the godfather of heavy metal.
We're paying respect to unexpected plumbers who've graced our profession. In this installment, we're introducing you to a lovable, pop culture icon.
When we think of common plumbing problems, leaks are almost always the first thing that springs to mind. In fact, we may handle more service calls for leaks than anything else. Well, except for clogs.
We have grown to what we are today by maintaining a commitment to service and absolute customer satisfaction. It's the foundation of everything we do!
Did you know that humidity can affect your health and wellbeing in a number of surprising and unexpected ways?! It is true! As humans, we are best off in an environment with medium humidity.
Who doesn’t want a cool job? One of those jobs everyone else is jealous of. One of those jobs you are proud to brag about at cocktail party, PTI meeting, or while socializing at your kid’s soccer game.
When was the last time you meet someone who absolutely loved their job? It doesn’t seem to happen very often, does it? Someone who loves their job has this amazing sense of confidence and happiness about them.
Every year in the United States, thousands of home burn to the ground as a result of domestic fires. Unfortunately, property damage isn’t the only cost of these home conflagrations.
What's the most valuable thing in your home? Your AC unit! This may come as a surprise, but some intrepid thieves make a living of stealing air conditioning units.
Tragically, carbon monoxide poisoning takes the life of thousands of individuals each and every year. Even more tragically, carbon monoxide poisoning is almost entirely preventable.
There are just a few things in life that we consider absolutely essential: food, water, air, a roof over our heads, clothing on our backs, and of course, one of the most important things all – toilet paper.
When most people think about ways to save money on their home insurance, they don't usually consider their major systems, such as the HVAC and plumbing
In today’s blog we are going to look at one particular urban legend that is closely linked to the HVAC industry: Casinos pump oxygen into the air to keep people awake, alert, and gleefully gambling.
We are going to ask you to close your eyes and picture your favorite hero. Who immediately springs to mind? It is probably Superman, Batman, Spiderman, or another fictional comic book character.
You probably thought a toilet was just a toilet. You probably thought that exciting things never happen in the toilet world. That is probably because you have never heard about dual flush toilets.
They should have cast us on the popular, hit show Mythbuster, because we are doing a lot of myth busting of our own this month. Now, our myths might not be as exciting as those featured on the show...
It was a crispy and cool spring morning in 1962. The clouds were just beginning to break over Florida as the sun shone through. It promised to be a beautiful day.
Grab your swimming suit, goggles, and shower cap, and get ready to dive in… to a lesson on septic systems. Settle in and get comfortable. Oh, you can take all the swimming gear off now.
Even if you're not an expert plumber, it doesn’t mean you aren’t a skilled and effective handyman. Exactly, what type of handyman are you though?
Windows and doors are gateways to the outside world, They can each be massive negatives in terms of your home’s energy performance.
So, you have decided you are tired of facing an immense energy bill month after month? Enough is enough! We understand, and we fully support you. Luckily, there are plenty of things you can do.
You might be wondering what backflow is. That is a good question, and one we are going to be covering thoroughly today. We will be discuss what backflow is, why it is bad, how we prevent it, and what to do if is occurs.
Toilet flanges come in many shapes, sizes, and materials, but they all do the same critical job -- namely, connect the toilet to the sewer drain pipe.
Sewer gas is not just an affront to the senses, it can actually be detrimental to your health as well. There is no mistaking when you smell sewer gas. You may be wondering, how is sewer gas produced? How does it get into my home, and what can I do about it?
You probably didn’t even know you had an expansion tank! Well, if you have a hot water heater, then odds are, you also have an expansion tank. The International Mechanics Code actually states that all hot water heaters should have an expansion tank.
NATE is a non-profit organization which certifies heating, ventilation, air conditioning, and refrigeration technicians. It was founded in 1997 and has become one of the highest standards for HVAC technician certification.
Do you have daughters in your home who love nothing more than running separate hair dryers at the same time? Is your electric system begging for help?
Sometimes to get a DIY job done you need to be able to turn off your home water supply or even your electrical power.
If you are like most people, cold showers are probably the bane of your existence. Not much is worse than having your steaming hot shower interrupted by a blast of frigid water.
Have you ever had a burn before? It is one of the most unpleasant injuries you can experience. The skin blisters and becomes raw, while the pain seems to never end. Fire is not the only thing that can cause burns.
Air conditioning units are complex machines. When something is extremely complex, that usually means a lot can go wrong with it. It also means replacing it is probably very expensive.
It is nearly a miracle. When you turn on a faucet here in Phoenix, Arizona – water flows out. Phoenix is built in the middle of one of the largest deserts in the entire world.
American families toss an astounding amount of waste down their kitchen sinks. At first thought, this may seem hazardous. You are sending that waste into the complicated and delicate depths of your home plumbing system.
For many months of the year England is a cold, dank, and dreary place. Residence of the great cities like London have always been looking for ways to keep warm.
As we last left the vacuum cleaner, the most modern device discussed had been John S. Thurman’s “pneumatic carpet renovator.”
Everyone hates chores, or at least most people do. If you are lucky enough to live with someone who enjoys chores, hold on to them. Don’t let them move out. Ever.
Everyone has experienced this particular emergency before, whether they were at a music festival, a construction site, an auto race, or on a camping trip.
Phoenicians are notorious wimps when it comes to cold weather. Heat we have no problem with. 115 out? Well that is just a typical balmy summer day. Why not throw on some shorts and go for a walk?
What better way to relax after a long and particularly stressful day of work than a nice hot bath? Light some candles, add a soothing bath bomb to the warm steaming water, maybe even pour yourself cool glass of pinot grigio.
A just question indeed. Tankless water heaters which are also known as instantaneous water heaters, heat water as it flows through a heat exchanging coil. It is not the same as a standard water heater.
The bathroom sink stopper is a crucial components to facilitating plumbing. However, over time, the sink stopper will inevitably become maladjusted causing the sink to lose water when you want it to hold water.
Plumbers know more about bathrooms than the average person. For example, most plumbers are aware that showers were virtually unavailable until the 1800s. It was not until the 1970s that showers became common place.
Why clean my air ducts? Simply put, it will facilitate cleaner air, a more sustainable AC system, and reduced energy bills. Indeed, a nice duct cleaning is like a complete detail on your car.
You may believe that your air conditioning unit is just one of those set-it-and-forget-it-type things. It’s not. As summer starts, be sure to tune up your AC.
Although plumbing is relatively straightforward, pipes can take on a life of their own. They can be dangerously sneaky. It’s important to cut off water leaks as soon as possible, and catch them before they overwhelm you.
For those do it yourselfers out there, nothing can be more riveting than installing a new faucet. So, if you have a leaky faucet and want to update it, we would be happy to share some tips.
Your HVAC system delivers air throughout your home. Making sure the air ducts are clean and properly sealed provides benefits for you and the entire family.
There are several sources of potential leaks in a house, but did you know that your ice maker could be one of them?
Cross-linked polyethylene, also known as PEX piping, is used to service pipework around the world and it is lauded for its light weight, and insulator properties & the technology has been around since the 1930’s.
Detecting a slab leak can be difficult because the symptoms are similar to plumbing leaks in general, but we have a few helpful things for you to try.
Sometimes, plumbing can be a dirty business. Sceptic tanks are utilized by a quarter of homeowners, according to the EPA. Obscure property locations and underdeveloped areas are all privy to use sceptic tanks for waste removal.
Well, the simple answer is that you want higher quality water. Although the Arizona Department of Environment Quality takes great pains to assure the valley’s drinking water is safe and readily available.
The word plumber comes from the Latin pluma, which means lead, the substance pipes were made from in antiquity. Nowadays plumbers use various metals for piping systems, including copper, steal, and even titanium.
Maintaining the highest levels of energy efficiency around the home is a key strategy for reducing energy costs on an annual basis.
Residential homeowners wishing to maintain an HVAC system in the best condition possible should consider a few simple and general tips and tricks.
It's only natural that you want the highest quality water in your home as possible. Fortunately, modern technology can help at an affordable price.
Perhaps one of the most affordable and most innovative ways of improving the overall efficiency of an HVAC system is to consider installing a programmable automatic thermostat.
Arizona heat is one of the most common problems with AC units, especially in mid-summer. Call Parker & Sons today for your AC Tune Up.
Nothing can be more distracting and more troubling than having a clogged toilet somewhere in the home. With that said, there are a few simple and essential methods of dealing with a clogged toilet.
Today’s typical HVAC system provides for impressively efficient heating and cooling on a daily basis without interruption. However, there are several key reasons why having an annual HVAC system tune-up is a good idea.
White-Rodgers recalls heating and cooling thermostats due to a potential defect with the alkaline battery setup.
Temperatures in Phoenix, Arizona typical start to slightly increase in April and continue through until September
The HVAC is responsible for ultimate comfort in your home and business; it controls your heating, ventilation and air conditioning, so when it isn’t functioning properly, you can definitely feel the effects.
According to Maria Vargas, spokesperson for EnergyStar, a division of the Environmental Protection Agency (EPA), energy bills can differ depending on the size and location on your home.
In a tough economic climate where businesses need to cut costs, Salt River Project now offers nearly $8 million in energy-efficiency rebates for businesses.
Mineral deposits in a shower head not are not just aesthetically displeasing but can cause blockages as well. If you’ve noticed that your water pressure in your shower is not as good as it once was, it may be time to take action.
We’re not only the best company in town, but the safest, as we go through an 8-STEP process to help protect you and our technicians: All techs are prescreened each morning for any COVID-19 symptoms.
Your garbage disposal gets rid of food waste. This means, in theory, it should be keeping foul smells away from your kitchen, right??
When it comes to powering your electronics, you have a few different options, but which one is best for your needs?
After a long day outside, the last thing you want is to come home and deal with air that’s far more polluted than outside!
So, it's not exactly a topic to bring up during Sunday brunch, but somebody has to do it – we're talking about the history of plumbing!
There's no easy answer to what temperature you should set your thermostat, especially when the whole family won't stop arguing over it!
Have you ever wondered, "How does my furnace work?" Well, whether you have or haven't, Parker & Sons will explain it today!
While most homes have access to clean water, the water quality can vary greatly. This is where a reverse osmosis system comes in!
The holidays are a time for family, friends, and giving thanks. But if you hosted Thanksgiving this year, your plumbing may be suffering.
Spring cleaning may be a lot of work, but it's worth it ... For the health benefits alone! Learn more about spring cleaning and air quality:
Many homeowners have experienced the frustrating and costly issue of a frozen air conditioner. There are quite a few potential causes of an AC unit freezing up.
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