Maintenance advice often fails in one of two directions: a list so long nobody does it, or a shrug that says "change the filter and hope." This guide aims for the useful middle, organized around Iowa's actual climate rhythm. Des Moines asks a furnace to run hard from roughly November through March and an air conditioner to fight humidity from June through September, with shoulder seasons in between that are perfect for preparation.

Year-round: the homeowner's short list

These tasks are safe, simple, and genuinely high-impact:

  • Filters: check monthly, change when dirty. In a house with pets or during heavy-use seasons, that can mean monthly changes. This single habit protects both the furnace and the air conditioner, because they share the same blower and airflow path.
  • Vents and returns: keep them open and unblocked. Closed vents do not save energy; they unbalance the system.
  • Outdoor unit clearance: keep two feet of clear space around the condenser, and clear cottonwood, grass clippings, and leaves from the fins.
  • Eyes and ears: you know your system's normal voice. New sounds, smells, or behavior are early warnings worth acting on.

Spring: prepare the cooling side

Before the first humid stretch, schedule professional attention for the air conditioner: coil condition, condensate drain, refrigerant lines, electrical connections, and general operation. Spring timing matters because contractor calendars are still open and any problem found now is a scheduled fix rather than a July emergency. The AC cleaning page explains what the visit should include.

Summer: watch and listen

Mid-season maintenance is mostly attention. Keep the outdoor unit clear as mowing and cottonwood season peak, stay on top of filters during heavy runtime, and take early symptoms seriously: gradually weaker cooling, softer airflow, or longer runtimes are the system asking for help before it fails. Our guide to AC cooling problems helps you describe what you observe.

Fall: prepare the heating side

Before the first real cold, schedule professional attention for the furnace: burners, flame sensor, ignition, blower, and a general safety inspection. Combustion equipment deserves a professional look annually, and fall timing has the same logic as spring: open calendars and no emergencies. The furnace cleaning page covers typical scope. If your furnace showed any of the warning signs last winter, fall is the time to act on them, not December.

Winter: protect the recovery position

In deep cold, a few habits reduce risk. Keep filters fresh since the furnace runs its longest hours now. Know where the furnace switch and breaker are before you need them. If you leave home in a cold snap, leave the heat set low rather than off, since frozen plumbing is a far bigger problem than the fuel it saves. And keep the emergency HVAC guidance in mind: if heat fails in extreme cold, treat it as urgent and confirm real-time contractor availability when you call.

What maintenance cannot do

Honesty matters here: no routine prevents every breakdown, and no cleaning visit guarantees safety or savings. What maintenance reliably does is remove the restrictions that make systems work harder than they should, and put professional eyes on your equipment regularly enough to catch small failures before they cascade. That is a solid return, and it is the honest one.

Scheduling it

Most Des Moines homeowners do well with two professional visits a year, spring for cooling and fall for heating, plus the homeowner tasks above. To schedule with an independent local contractor, call (515) 724-6446, and verify licensing and insurance before authorizing any work.