Monthly Tasks
Check and replace the air filter
A dirty filter is the #1 cause of HVAC inefficiency and breakdowns. Check monthly; replace every 1–3 months depending on filter type and household conditions (pets, allergies, etc.).
Check thermostat settings
Ensure your thermostat is set correctly for the season. If you have a programmable thermostat, confirm schedules are set appropriately.
Inspect supply and return vents
Make sure furniture, rugs, or curtains aren’t blocking airflow from supply vents or return air grilles.
Listen for unusual sounds
Take a moment each month to listen to your system running. Banging, rattling, or high-pitched sounds can indicate developing issues.
Spring (Pre-Cooling Season) Tasks
Complete these in March or April before DC's summer heat arrives.
Schedule your AC tune-up
Book a professional cooling system tune-up with CoolHVAC before the summer rush. Appointments fill up fast in May and June.
Clear debris from outdoor unit
Remove leaves, dirt, and debris from around your outdoor condenser unit. Maintain at least 2 feet of clearance on all sides.
Clean or replace air filter
Start the cooling season with a fresh filter.
Test the AC before it gets hot
Run your AC on a mild spring day to confirm it’s cooling properly before you actually need it.
Check window seals and weatherstripping
Gaps around windows and doors make your AC work harder. Seal any drafts before summer.
Program thermostat for cooling season
Update your thermostat schedule for summer. Raise the setpoint when you’re away to save energy.
Fall (Pre-Heating Season) Tasks
Complete these in September or October before the first cold snap.
Schedule your heating tune-up
Book a professional heating system tune-up with CoolHVAC before the fall rush. Don’t wait until your furnace stops working on the first cold night.
Test the heat before you need it
Turn on your heat on a cool fall day to make sure it’s working properly before temperatures drop.
Replace air filter
Start the heating season with a fresh filter.
Check carbon monoxide detectors
Test all CO detectors and replace batteries. CO leaks from furnaces can be life-threatening.
Clear area around furnace and vents
Remove stored items from around your furnace and ensure all heating vents are unobstructed.
Program thermostat for heating season
Update your thermostat schedule for winter. Lower the setpoint when you’re away or asleep to save on heating costs.
Annual Tasks (Have a Pro Do These)
Full system inspection and tune-up
A certified technician inspects every component, tests system performance, and addresses any issues before they become failures.
Refrigerant level check
Low refrigerant means your AC is either leaking or was undercharged at installation. A technician can test and recharge as needed.
Coil cleaning (evaporator and condenser)
Dirty coils reduce efficiency and can cause the system to freeze up. Professional cleaning restores performance.
Duct inspection
Have your ductwork checked for leaks, blockages, or insulation issues. Leaky ducts can waste 20–30% of your conditioned air.
Heat exchanger inspection (gas furnaces)
A cracked heat exchanger is a serious safety hazard that can allow carbon monoxide into your home. This should be checked annually.
Electrical connection tightening
Loose electrical connections cause efficiency loss and can create fire hazards. A professional will check and tighten all connections.
What Homeowners Can Do vs. What Needs a Pro
DIY-Friendly Tasks
- Replace air filters
- Clear debris from outdoor unit
- Check and update thermostat settings
- Test CO detectors
- Keep vents unobstructed
- Visual inspection for obvious issues
Requires a Certified Tech
- Refrigerant handling
- Coil cleaning
- Heat exchanger inspection
- Electrical component testing
- Ductwork inspection and sealing
- Any repair work
Ready to schedule your tune-up?
CoolHVAC handles all the professional tasks on this list. Spring and fall tune-ups available across the DC metro area.
Schedule a Tune-Up