HVAC Repair in Frederick, MD
Homes here need heat from October through April and cooling from June through September. If your system quits, tell us what it's doing and a licensed contractor who covers Frederick County will get in touch.
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Eleven months of work, most winters below freezing
Frederick County only gives your system a month to rest. Heat runs October through April, then cooling takes over in June and doesn't let up until September. Winter nights average 26°F, cold enough that the furnace cycles on and off most of the night to hold the temperature. Summer afternoons average 84°F, so the air conditioner is working through the hottest part of nearly every day for four straight months.
Over half the homes here heat with electricity, which means a tripped breaker or a power problem takes the furnace down with it. That matters in a county that's logged 276 damaging wind events and 23 winter storms over the past ten years. Statewide, 11% of households lost power for at least 24 hours in 2024. When the power comes back, most systems restart on their own, but a system already worn from a full season of runtime is more likely to need a hand.
- 7 months
- October through April, your system heats
- 4 months
- June through September, it cools
- 26°F
- the average winter night it heats against
- 84°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
Maryland requires HVAC contractors to hold a state license.
The Maryland Board of Heating, Ventilation, Air Conditioning, and Refrigeration Contractors is the body that tests and licenses HVAC contractors in this state. That license belongs to the contractor, not to the job, so a licensed contractor working in Frederick County is carrying the same license the board issued them, not a separate permission for this particular repair.
For a repair to your heating and cooling system, that license is what stands behind the person doing the work. It tells you the state tested this contractor and keeps them on record, and it applies to them no matter whose house they are in that day.
Sources: Maryland General Assembly · Maryland Department of Labor
- Why is my heat not working?
- Start with the thermostat. If the screen is blank, check the batteries or the breaker before assuming the furnace itself failed. If the thermostat is fine, the furnace may not be getting power or gas. A tripped breaker, a switch near the unit turned off, or a gas valve that got bumped closed can all stop it cold. If the furnace runs but never lights, or lights and shuts off again, that points to something like the igniter or flame sensor, and it needs a contractor to look at it. With winter nights here averaging 26°F, it is worth checking the simple things first so you are not without heat longer than you need to be.
- Why is my system running but not cooling the house?
- The most common cause is a dirty air filter choking off airflow. Check it first and replace it if it is gray or clogged. If the filter is clean and the air coming from the vents is warm or barely moving, the problem is likely with the outdoor unit or the refrigerant charge, and that calls for a contractor. Ice on the outdoor unit or the line running to it is also a sign something inside is not working right, and running the system longer will not fix it. On an 84°F afternoon a struggling system falls behind fast, so it is worth checking the filter as soon as you notice the house isn't cooling.
- What can I check before calling for HVAC repair?
- Check the thermostat settings and batteries first, since a wrong setting or a dead battery looks exactly like a bigger problem. Next, check the air filter and replace it if it is dirty. Look at the breaker panel for anything tripped, and make sure any power switch near the indoor or outdoor unit is turned on. If the outdoor unit is covered in leaves or debris, clear the area around it. If you have done all that and the system still is not heating or cooling right, a contractor will need to look at the parts inside that you cannot check yourself.