A checklist split into two columns
Every season brings two kinds of HVAC work. Some tasks you can handle with a flashlight and a fresh filter. Others belong to a technician with gauges and a combustion analyzer. This checklist for Rocky Mount homes keeps the two apart so you know which jobs are yours and what to ask for when you book a visit.
Late winter: get ahead of the cooling season
Your list
- Find the filter slot, note the exact size printed on the frame and buy a few spares.
- Walk around the outdoor unit and pull away vines, fallen branches and anything stored against it.
- Check that the outdoor unit still sits level on its pad.
- Look at the insulation on the larger refrigerant line; replace sections that are cracked or missing.
Ask for on a service visit
- a cooling check before the first warm spell, with refrigerant readings written on the ticket;
- a look at the electrical connections and the capacitor in the outdoor unit;
- a cleaning of the indoor coil if the technician finds dust or growth on it.
Spring: first cooling runs
Your list
- Change the filter.
- Switch to cooling on a mild day and listen. A steady hum is normal; grinding, rattling or a buzzing that never settles is not.
- Pour a cup of water into the condensate drain line, if it has an access port, and confirm it drains.
- Make sure every supply register is open and nothing sits on top of a return grille.
Call a technician if
- the outdoor fan doesn't spin while the compressor runs;
- the breaker trips when cooling starts;
- the air from the registers never feels cooler than the room.
Summer: steady running
Your list
- Check the filter monthly during heavy use and change it when it looks gray.
- With the power off at the disconnect, rinse the outdoor coil gently from the inside out with a garden hose. Skip the pressure washer.
- Look at the drain pan under the indoor unit for standing water.
- Note any room that won't cool down in the afternoon; it belongs in your next service ticket.
Warning signs
- frost or ice on the refrigerant lines or the indoor coil;
- water dripping from a ceiling under an attic air handler;
- the system running without stopping on an ordinary day;
- short bursts of cooling that end within a few minutes and start again.
If you see ice, switch the system off and run only the fan until a technician arrives.
Fall: switch over to heat
Your list
- Change the filter again.
- Test smoke and carbon monoxide alarms, and replace their batteries.
- Run the heat on a cool morning. A brief dusty smell is normal at first; a smell of burning plastic or hot wiring is a reason to shut it off.
- Clear leaves from the outdoor unit if you have a heat pump, and from any furnace intake and exhaust pipes on an outside wall.
Ask for on a service visit
- for a gas furnace: burners, flame sensor, ignitor, heat exchanger inspection and a carbon monoxide reading;
- for a heat pump: the reversing valve, the defrost control and the backup heat strips;
- the thermostat's backup-heat settings, so the strips don't run more than they need to.
Winter: cold-weather habits
Your list
- Keep the area around the outdoor unit open, and don't cover the unit with a tarp while it's running.
- Expect a heat pump to go into defrost now and then; a short cloud of steam is part of the cycle.
- Keep the thermostat steady on the coldest nights. Large setbacks can force the backup heat on when you raise it again.
- Check the furnace flue and intake pipes for blockage after a hard frost or a storm.
Call a technician if
- the outdoor unit is wrapped in solid ice and stays that way;
- the "emergency" or "auxiliary" heat light stays on for hours;
- a gas furnace starts and shuts off repeatedly, or the carbon monoxide alarm sounds. Leave the house and call for help first if the alarm sounds.
Repair or replace: questions to ask
When a technician quotes a large repair, ask for a replacement quote at the same visit so you can weigh both. North Carolina falls in the Department of Energy's hot-humid Southeast region, where split-system central air conditioners installed on or after January 1, 2023 must be rated at least 14.3 SEER2 (13.8 SEER2 for 45,000 Btu/h and larger), and split-system heat pumps must meet 14.3 SEER2 and 7.5 HSPF2 nationwide. Then ask:
- How old are the compressor and the indoor coil, and is either one still under warranty?
- Does the current refrigerant affect the price of this repair or of future service?
- Will a replacement include a room-by-room load calculation and a look at the ducts?
- What would the replacement cost to operate compared with the current system after repair?
- What state license, if any, covers this work, and what is the number?
- Which permits would a replacement need, and who pulls them?
Keep a service log by the air handler
Tape a sheet near the indoor unit and record each filter change, every service visit with the technician's name and readings, repairs and parts replaced, and the model and serial numbers of both units. A log turns a vague complaint into a clear history, helps with warranty claims and shows the next technician what has already been tried.