HVAC Maintenance Checklist for DMV Homeowners

Spring (March – May)

• Replace air filters — Do this every 1–3 months depending on usage
• Clean outdoor condenser unit — Remove debris, leaves, and trim vegetation 2 feet around it
• Test your AC — Turn it on before the heat hits to catch issues early
• Check thermostat — Switch to cooling mode, verify it's working correctly
• Schedule a professional tune-up — Annual AC maintenance catches refrigerant leaks and worn parts

Summer (June – August)

• Check air filters monthly — Summer dust and pollen clog filters fast
• Keep vents clear — Move furniture away from supply and return vents
• Monitor your energy bills — A sudden spike may indicate system problems
• Clear the condensate drain — A clogged drain causes water damage and mold

Fall (September – November)

• Schedule furnace inspection — Before the first cold snap
• Replace air filters again
• Test your heating system — Run it for 30 minutes and check for strange noises or smells
• Seal ductwork — Leaky ducts waste up to 30% of heating energy
• Check carbon monoxide detectors — Critical for gas furnace safety

Winter (December – February)

• Keep filters fresh — Heavy furnace use clogs filters quickly
• Don't block heat registers — Ensure warm air circulates freely
• Set thermostat to 68°F — Every degree above costs about 3% more energy
• Watch for ice on outdoor unit — Heat pump ice buildup needs professional attention

When to Call a Pro

Some tasks require a certified HVAC technician: refrigerant handling, electrical work, gas connections, and ductwork repairs. At All Purpose, our certified technicians service all major HVAC brands across Maryland, DC, and Virginia.