HVAC Maintenance Checklist & Filter Guide
Your heating and cooling system is the mechanical lungs of your house. It is also one of the most expensive systems to fix. A replacement compressor or heat exchanger can easily cost $3,000 to $5,000+. Regular preventative care keeps your system running efficiently.
How Often Should You Replace Filters?
Filter replacement is the single most important task for HVAC longevity. The correct frequency depends on your filter thickness and household:
- 1-inch Pleated Filters: Replace every 30 to 90 days. Check them monthly if you have pets.
- 4-inch Media Filters: Replace every 6 to 9 months. These contain more surface area and filter smaller particles.
- Fiberglass Flat Filters: Replace every 30 days. These offer low air restriction but do not capture fine dust.
Seasonal HVAC Checklists
Spring Checklist (AC Focus)
Before the heat of summer hits, prep your air conditioner:
- Clear leaves, brush, and grass clippings from the outdoor condenser unit.
- Inspect the condensate drain line for algae blocks. Flush with vinegar.
- Confirm vents are open and not blocked by furniture.
Fall Checklist (Furnace Focus)
Before freezing temperatures arrive, inspect your heating system:
- Turn on the furnace early to verify there are no ignition failures.
- Listen for unusual squealing, rattling, or thumping noises from the blower.
- Verify carbon monoxide alarms are functional near your bedrooms.
"Nearly 80% of all HVAC compressor failures are caused by restricted airflow, usually from a dirty filter."
Protect Your System and Savings
Neglecting your system leads to higher electricity bills and early breakdown. Setting up recurring, automated reminders ensures you check filters and clean coils on schedule, adding years of life to your equipment.