What NOAA lists for Cedar Rapids
NOAA's engineering weather data for the Cedar Rapids station, at an elevation of 869 feet, gives a 99% winter design temperature of -5°F and a 1% summer design temperature of 89°F with a mean coincident wet-bulb temperature of 74°F. The same Cedar Rapids data lists a 50-year basic wind speed of 90 mph (3-second gust at 33 feet), a 100-year rainfall rate of 3.3 inches per hour and about 54 freeze-thaw cycles in an average year.
How to use this list
Instead of walking through the calendar, this checklist follows the system itself, one part at a time. Under each part you will find what to do and roughly when in the year to do it. Lines marked Technician need someone with meters, gauges or a combustion analyzer. Everything else is owner work that needs nothing more than a flashlight and a little care. Before you open any panel or touch the outdoor unit, switch the system off at the thermostat and shut off power at the furnace switch or the outdoor disconnect.
The filter and the air path
- Find the filter slot and write down the exact size printed on the frame. Keep spares on hand.
- Check the filter monthly during the heaviest heating and cooling weeks, and replace it when it looks gray. Mark the date on the frame.
- In early fall and again in late spring, walk the house and make sure supply registers are open and return grilles are not blocked by rugs, beds or bookcases.
- Vacuum dust from return grilles when you change the filter.
- If a room suddenly gets weaker airflow, look for a closed damper or a crushed duct you can see before calling anyone.
The furnace or heat pump indoors
- In early fall, run the heat on a mild day so any problem turns up before the first cold night. A short dusty smell is common; a smell of hot plastic or wiring means switch it off and call.
- Keep the area around the furnace clear of storage, paint cans and laundry piles.
- Listen when the burner lights. A soft whoosh is expected; a loud bang or rumble is a reason to call.
- Heat pump owners: watch how often the thermostat shows auxiliary or emergency heat during cold spells, and write down when it happens.
- Technician, before the heating season: burners, flame sensor, ignitor, heat exchanger inspection, gas pressure and a combustion test for a furnace; reversing valve, defrost control and backup heat strips for a heat pump.
Venting and the flue
- After every heavy snow, check that plastic intake and exhaust pipes on an outside wall are clear. Brush snow away by hand rather than with a shovel blade.
- Look for frost or ice building up around the pipe ends during long cold stretches, and call if it starts to close them off.
- If your furnace vents into a metal flue, look along the pipe once a year for rust, gaps or loose joints.
- Test carbon monoxide and smoke alarms in the fall, and replace batteries on the schedule the maker gives.
The outdoor unit
- In spring, clear leaves, seed fluff and grass clippings from the coil and the top grille.
- With power off at the disconnect, rinse the coil gently from the top down with a garden hose. Keep a pressure washer away from the fins.
- Trim shrubs back so the unit has the clearance its installation manual lists on each side and above.
- Check that the pad or stand is still level and that the refrigerant line insulation is intact.
- Heat pumps in winter: keep snow and ice from piling against the unit, and let defrost cycles run. A brief cloud of steam is part of normal defrost; a thick block of ice that keeps growing is not.
- After a strong storm, look for bent fins, a shifted pad or debris inside the cabinet before you switch back on.
- Technician, before the cooling season: refrigerant charge, capacitor, contactor and electrical connections.
Drains and the indoor coil
- In late spring, find where the condensate line ends, often at a floor drain or a pump, and make sure it flows.
- If you have a condensate pump, pour a little water into it and confirm it switches on and empties.
- Look at the pan under the indoor coil for standing water during the cooling months.
- Ask a technician whether any cleaner is safe for your drain line.
- Technician: coil cleaning when dust or growth is visible, and a test of any float switch.
The thermostat
- Replace thermostat batteries once a year if it uses them.
- Keep settings steady on the coldest nights if you have a heat pump; a big setback can call the backup heat on when you raise it again.
- Review your schedule each spring and fall so it matches how the house is used.
Signs that need a technician
- Ice on the larger copper line or the indoor coil in summer.
- A breaker that trips again after you reset it.
- Water on the floor around the furnace or air handler.
- Short bursts of heating or cooling that stop within minutes and start again.
- A yellow, flickering burner flame, soot around the furnace or a CO alarm going off. Leave the house and call for help from outside.
Before you agree to a replacement
A large repair estimate is a fair moment to price a new system alongside it. Questions for anyone quoting one:
- Will you run a room-by-room load calculation and give me the report?
- What efficiency rating does the exact pairing of indoor and outdoor units carry, and what is its AHRI reference number?
- Are duct testing and sealing in the price?
- What state license or registration, if any, covers this work, and what is the number?
- Which city permits will the work need, and who pulls them?
- Can you show proof of liability coverage and workers' compensation?
Keep a service record
A single page taped inside the furnace closet door does the job. Write down the filter size and every change date, each service visit with what the technician found, any refrigerant added, parts replaced, and the model and serial numbers for the indoor and outdoor equipment. With that page in hand, a technician can work faster and a warranty claim is easier to support.