Why Timing Matters Here
Des Moines weather concentrates HVAC failures into predictable windows: the first sustained heat wave of June and the first hard freeze of late fall. Contractors' phones explode in both windows, which means the homeowner who scheduled maintenance in the quiet weeks gets seen fast and the one who waited competes with everyone else. Maintenance timing is not about fussiness; it is about getting attention before the rush.
Spring (March to May): Cooling Prep
- Replace the filter; start the season clean.
- Clear two feet around the outdoor condenser; rinse cottonwood and debris with power off.
- Run the AC on a mild day before you need it; confirm cool air and normal sounds.
- Check that the condensate drain flows; a clogged drain becomes water damage in July.
- Schedule professional cooling maintenance before the June rush.
Summer (June to August): In-Season Care
- Check the filter monthly; peak season loads it fastest.
- Keep the condenser clear as vegetation grows and mowing debris accumulates.
- Watch for ice on lines, short cycling, or declining performance; early calls beat heat-wave emergencies.
- Use thermostat setbacks sensibly; extreme setbacks force long recovery runs in humidity.
Fall (September to November): Heating Prep
- Replace the filter again before heating season.
- Run the furnace on a cool morning; confirm heat and note any persistent smells beyond the normal first-run dust burn-off.
- Test carbon monoxide detectors and replace batteries; heating season is CO season.
- Schedule professional heating maintenance before the first freeze rush.
- If your furnace is old and repaired often, fall is quote season for replacement, on your schedule.
Winter (December to February): Operating Care
- Check the filter monthly; winter runtime is heavy.
- Keep vents and returns unblocked by furniture and holiday rearrangements.
- Keep intake and exhaust vents clear of snow and ice after storms.
- Know where the furnace switch and breaker are before you need them at midnight.
Year-Round
- Do not close off rooms; balance airflow with a contractor's help instead.
- Write down what the system does when something seems off: symptoms and timing make professional diagnosis faster and cheaper.
- Keep the area around the furnace clear of storage and anything flammable.
Details on each service live on the AC cleaning and furnace cleaning pages. No maintenance schedule guarantees the prevention of breakdowns, but this one stacks the odds firmly in your favor.