Most Philadelphia homes run one machine hard twice a year: the air conditioner through a humid summer, the furnace, boiler or heat pump through a cold winter. That is why the standard maintenance rhythm is twice a year, not once. The cooling side is checked and cleaned before the first hot week, the heating side before the first cold one. If you have a heat pump, the same outdoor unit does both jobs, so it gets looked at in both seasons.
What the twice-a-year visit is really for
Three things go wrong quietly in a cooling system, and all three get worse the longer they sit.
- A dirty filter and dirty coils. Air has to move through the indoor coil for the system to cool. Dust on the filter and on the coil itself blocks that air. The Department of Energy's guide to maintaining your air conditioner puts a clogged filter first on its list, and notes that a dirty filter lets dust reach the coil, where it is much harder to clean off.
- A blocked condensate drain. An air conditioner pulls water out of the air all summer. That water leaves through a drain line, and that line grows algae and slime. When it blocks, the water backs up into the pan, then into the ceiling or the floor under the air handler. A water stain on a bedroom ceiling in August is very often a condensate line, not the roof.
- A refrigerant leak. A system low on refrigerant cools poorly and runs constantly. Adding refrigerant without finding the leak is a temporary fix, and refrigerant handling is licensed work.
The heating-side visit looks at different things: burners, the heat exchanger, the flue, and safety controls. Our post on a heating tune-up before winter covers that half of the year.
What you can do yourself between visits
- Change or wash the filter. The Department of Energy's guidance is to check the filter monthly during heavy use and change it at least every three months. In a home with pets, a window open onto a busy street, or ongoing renovation work, it will be sooner. Write the date on the edge of the filter with a marker so you are not guessing.
- Keep the outdoor unit clear. Leaves, grass clippings, bags and overgrown shrubs against the condenser block the airflow it needs to dump heat. Leave a couple of feet of open space around it, and rinse the fins gently with a hose with the power off at the disconnect.
- Watch the drain. If you can see the condensate line and its pan, look at it on a hot day. Standing water in the pan means the line is not draining.
- Listen. A new rattle, a hum that did not used to be there, or a system that starts and stops every few minutes is telling you something before it fails.
The connection to mold
Cooling equipment handles water by design, which is why neglected equipment is a common source of indoor mold. A coil that stays wet, a pan that never empties and a duct that sweats are all damp surfaces with dust on them. The EPA's brief guide to mold, moisture and your home is blunt about the rule that matters: control the moisture and you control the mold. It also recommends keeping indoor humidity below 60 percent, which a working air conditioner does for you in a Philadelphia July.
If you see mold inside the air handler or in the ducts, do not run the system while you decide what to do. Spreading spores through the whole house with the blower is the one thing worth avoiding. The same EPA guide covers when duct cleaning is and is not appropriate.
Stop and call someone if
- The system freezes into a block of ice on the line or the coil.
- The breaker for the air conditioner trips more than once.
- There is water around the air handler or a stain on the ceiling below it.
- You smell something burning, or a sharp chemical smell near the indoor unit.
- The system runs and runs without the house getting cooler.
The first two are the most common and the most misread. Both usually mean restricted airflow or low refrigerant, and both can wreck a compressor if the system keeps running that way.
Booking it
Spring is busy for cooling work and fall is busy for heating work, which is the practical argument for booking off-peak: late winter for the cooling check, late summer for the heating one. If you want more than one price, describe the job once on HomeKept and compare estimates from HVAC pros serving Philadelphia. Before you choose anyone, it is worth reading how to check a contractor in Philadelphia — license, insurance and the questions that separate a real quote from a number over the phone.
HomeKept is a brand of FalconAI LLC, 331 E Street Rd, Feasterville-Trevose, PA 19053.
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