The single best maintenance habit a homeowner can build is awareness — knowing what your system sounds like, smells like, and costs to run when it's healthy.
What annual service actually does
A good annual service checks refrigerant charge, electrical connections, capacitor health, blower current draw, drain pan condition, and airflow. Done right, it catches the $200 capacitor before the $1,200 weekend emergency.
Filters and airflow
More HVAC complaints come from neglected filters than from failing equipment. Check monthly during cooling season — see our MERV guide.
Common symptoms
Warm supply air, ice on the line set, clicking outdoor units, water around the air handler — covered in the cluster below.
DIY vs. call a pro
Filters, thermostat batteries, clearing the outdoor unit, resetting a tripped breaker once. Anything involving refrigerant, capacitors, or repeated breaker trips is a service call.
In this pillar
Why Is My AC Running But Not Cooling?
Six likely causes, what's safe to check yourself, and when to stop.
Signs Your HVAC Needs Service
The symptoms worth a same-week call.
Comparing service providers?
The criteria we use to vet contractors apply just as well to a service relationship.