Heating & AC Questions

1What is the purpose of auxiliary heat?
Under normal operating conditions, the auxiliary heat is brought on automatically by the thermostat when the indoor temperature drops during heat pump operation. There are also times during cold, wet weather when the outdoor coil may ice up and your heat pump will go into a defrost cycle. This is nothing more than reversing the process back to cooling mode. Cooling mode makes the outdoor coil hot and melts any ice. The defrost cycle should only last a few minutes and then return to heating mode. During the defrost cycle, your comfort system is in cooling mode and the supply air is cool. To offset this cool air, the auxiliary heat will be energized during defrost. A mist or fog may be visible from the outdoor unit during defrost.
2Is there any advantage to setting my thermostat fan to “On” so the fan runs constantly?
Yes, there are a couple. The first is that you get constant filtering of the air in your home. The second is that because the air is moving, you have a more even temperature throughout the home. However, continuous fan mode during the cooling season may not be appropriate in humid climates. If the inside of your home feels uncomfortably humid, it is recommended that the fan be used in “Auto” mode.
3How important is it to get the right size of heating and cooling equipment?
Sizing HVAC equipment is very important from the standpoints of both comfort and energy use. Heating and cooling equipment that are over-capacity will not run as frequently or as long when it does run. In both cases, this may mean poor humidity control. It could also result in temperature variations or noticeable cycling. Over-capacity equipment will not be as energy efficient as properly matched capacity either. On the other hand, equipment that is under-sized, will obviously result in loss of comfort during temperature extremes.
4How are the sizing capacities of heating and cooling systems measured?
Heating and cooling systems sizing is based on B.T.U.H. (British Thermal Units Per Hour). Air Conditioning and Heat Pumps are also rated in tonnage. 12,000 BTUH equals one (1) ton. Residential systems can range from 1 to 5 tons
5How do I know if my system is working properly?
Is it making strange noises? Is it cooling or heating all areas of your home sufficiently? Has it been taking longer to cool down or heat up? Have your utility bills been rising for no apparent reason? Any of these are signs that you may have a problem that needs service. In most cases, the longer you delay, the worse any underlying problems will get. So be sure to contact Horizon Services to check out your system whenever you notice anything out of the ordinary.
6Is there anything I should check prior to calling for service?
Check to be sure that the air conditioner or furnace is turned on. Check that the breakers and the disconnects are turned on and be sure the thermostat is set correctly. Also make a note of any strange noises or smells.
7How often should I have maintenance done on my air conditioner?
You should have maintenance done on your air conditioning system at least once a year – spring to early summer being the best times. This not only ensures maximum efficiency, it enables us to foresee any possible problems that may occur in the near future.
8In addition to changing my filters, what maintenance should I do on my heater and/or air conditioner?
Most maintenance should be performed only by a qualified service technician. But here are some things that you can do to assure optimal performance:
  • Keep ground mounted outdoor units clear of debris, clutter and weeds; they can reduce the airflow to the unit.
  • Use caution with weed trimmers around the unit to prevent damaging control wiring.
  • Keep pets away from the unit; pet urine can cause expensive damage.
9How often should I replace my filters?
In general, All Pro Heating and Air recommends that you replace your disposable filters at least once a month. If you have washable filters, they should be cleaned once a month. Your All Pro Heating and Air service technician will recommend a replacement schedule that delivers the optimum efficiency and filtration for your specific system. With a All Pro Heating and Air Service Partner Plan, we clean and inspect your HVAC system twice each year. Part of the service includes changing the filters or servicing your filtering system. Unless you have special circumstances, our service should be adequate. We recommend that you visually check filters and filtering equipment monthly. If filters look dirty, they need to be cleaned or replaced.
10Why do I need to change my filter regularly?
Regular filter replacement helps your heating and cooling system operate at peak levels and improves indoor air quality. It is important to change filters regularly to ensure proper air flow and to keep your home free from dust, allergens and germs. Depending on the type of filter you have, you may require weekly or monthly filter replacements. Your Horizon Services service or installation technician will recommend the ideal filters and replacement schedules for your unit(s).
11What regular maintenance do heating and air conditioning systems need?
The most important part of HVAC maintenance aspect is maintaining unrestricted air flows. Dust, dirt, and debris are an HVAC system’s worst enemies. Whether it’s an indoor or outdoor unit, you must keep all filters clean and heat exchangers and coils free of restrictions. We recommend that your heating and cooling system be checked and serviced twice a year; ideally a spring and autumn tune-up. Also we recommend that you change your filter regularly, depending on the type of filter you have. This alone can eliminate many of the most common problems that need fixing and can significantly reduce the likelihood of a serious breakdown.

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