Frequently Asked Questions


Find answers to the most common questions about A/C and Heating repair, installation and service.

What is the best air conditioner for my home?

That is a great question.  Determining the correct air conditioner for your home depends on a number of factors including the size of your home, whether your home has existing ductwork, your energy usage, and the SEER rating of the unit.  Buying a unit that is too small or too large will keep you from operating efficiently and can keep your home warmer than you want it to be. For traditional air conditioner installations, the top five brands are: Trane, Amana, Carrier, Lennox, and Rheem.  Each brand has its own fans and its own strongpoints.

Why is my AC leaking water?

There could be a few reasons that your AC is leaking.

  • Clogged Condensate Drain Line.  The most obvious is a clogged condensate drain line.  When your air conditioner is working properly, it condenses water out of the air.  This water then drips into your condensate drain line, which removes it from your home.  If that line gets clogged, it can cause a backup into your house.  Many homes have overflow lines that extend outside, but if you can see water dripping from your AC, even if it is outside of your home, it indicates a problem.  
  • Dirty Air Filter. If your air filter is dirty, it can block the airflow to the evaporator coil. The coil freezes up.  When the coil melts, it begins to drip.  This increase in water may be too much for your drain pan and cause it to overflow. 
  • Low Refrigerant.  Low refrigerant results in lower pressure in the system, which can cause a frozen evaporator coil.  When the coil melts, it begins to drip.  This increase in water may be too much for your drain pan and cause it to overflow.
  • Damaged Drain Pan.  Designed to work with the normal condensate system, a drain pan catches the condensation.  If the drain pan gets damaged, water will leak. 
  • Broken Condensate Pump.  If your AC unit is in a basement, then it uses a pump to get the water outside. If that pump breaks, you get a leak. 

Why is my AC icing up outside?

While a number of things can cause your AC unit to ice up, there are three very common causes for a frozen AC unit.

  • Cool Summer Nights.  A particular problem in a desert environment, cool nights can mess with your air conditioning system.  Air conditioners are designed to work with certain ambient outdoor temperatures.  You can use a programmable thermostat to keep your air conditioner from trying to operate when the outdoor temperature is below 60 degrees.  
  • Dirty Air Filters.  Dirty air filters prevent the air conditioner from getting enough air.  Without that air, humidity settles on the coils, where it freezes.  So, if your system is frozen, one of the first things to do is to check your air filters.  You can check to see if this is the problem by turning off your AC for long enough to thaw (1 to 3 hours), then turning on the fan for an hour.  Replace your filters during that time.  If your AC is back to normal after that process, dirty filters were the culprit. 
  • Low Refrigerant.  Low refrigerant levels cause a drop in pressure.  This allows the refrigerant to expand, which lets it become too cold, and the system freezes.  If you have a coolant leak, you need a professional to find and fix the source of the leak and recharge the system.  

Why is my AC blowing warm air and I have the thermostat set to cool?

There are a bunch of reasons that your AC is blowing warm air, even though the thermostat is set to cool.  Some are easy problems that have a quick DIY fix, like replacing dirty air filters.  Others can be major problems that require repair or even replacement. If none of those seem to be the culprit, then you may have a refrigerant leak. Things to check include: 

  • Are the air filters dirty?
  • Is the evaporator coil frozen? 
  • Is your thermostat on the right setting? 
  • Is the outside unit getting electricity? 

Why are all of my rooms cool but one room is hotter than the rest of the house?

There are a number of reasons that one room could be warmer than the rest of the house.  Many of them have simple solutions. If your air ducts seem fine and none of the below solutions helps fix your temperature issues, you may have a problem with your air balancing.  An HVAC company can help determine what issue is causing the balance problems and help correct that issue. Check and correct the following things to see if it fixes the temperature issue: 

  • Replace dirty air filters.
  • Make sure the vent is fully open in the room that is hotter.  Shut vents a little in rooms that are too cold. 
  • Shut your windows.
  • Inspect your air ducts for kinks, crushes, and leaks. 

How much does a new AC install cost?

That depends on the size and type of your air conditioner. Costs range from around $2,000 to $10,000, with the average prices being just under $6,000.

When should I service my AC unit in Arizona?

We suggest that you service your HVAC system twice a year. We recommend servicing your AC in the late winter/ early spring before you begin to use it for the spring and summer seasons. We recommend servicing your heater in the late summer/ early fall before you use it for the late fall and winter season.

How often should I change my air filters?

That depends on the type of filter you have, whether you have pets in your home, how much dust you have, and other factors. Generally, we recommend changing filters at least every 90 days and sometimes as often as every 30 days.

Is a bigger air conditioner better?

Bigger is not always better. If you buy an AC unit that is too big for your home, it will be inefficient and may not eliminate humidity. While it will cool the air quickly, it may not cool it completely. It also causes more wear and tear, which can shorten its lifespan. If you buy an AC unit that is too small, it will not be able to keep up with your cooling demands. It is important to buy a system that is the right size for your home.

What is the lifespan of an HVAC system?

HVAC systems usually last from 10 to 15 years, with declines in efficiency and performance as they age. However, some components of your system may last longer. For example, furnaces can last 20 years or more.

Can I get Freon-22 to recharge an old system?

Maybe. It is becoming increasingly difficult to find Freon-22 to replace leaks in systems. Freon-22 has been replaced by Freon R-410A. When you can get Freon-22, its costs can be prohibitive. For many people, it may be less expensive to replace a system than to fix a leak and recharge it.

Can I replace just the indoor or outdoor parts of my HVAC unit?

It depends. If you are replacing an older system that uses Freon F-22 or have a SEER of 10 or less, you will not be able to find matching parts. The Freon type and SEER rating of your indoor and outdoor units need to match.

Can my air conditioner improve my indoor air quality?

Yes, you can install filtration and air purification systems in your air conditioner system.

Is duct cleaning important to keeping my air conditioner running?

Not necessarily. Debris should not build up in a properly maintained, properly closed system. However, if you have not maintained the system or if there was any problem with the duct work, registers, grilles, or diffusers, then you may need duct cleaning.

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Worlock AC & Heating Specialist is a leading provider of HVAC services in the Pheonix, AZ areas, offering the highest standards of service when it comes to your HVAC system. Conventional AC, ductless mini-split, furnaces, or heat pumps, we service and install them all. We are dedicated to giving our Pheonix, AZ customers the assistance they deserve when it comes to AC installation, and when it comes time to say goodbye to your old system, we can assist you with the highest quality air conditioner replacement. For a free estimate for your HVAC needs, or to access our emergency AC repair services, get a free quote, and you will have a certified HVAC contractor at your door in no time!

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