Heat Pump Fall Checklist for Sallisaw, OK: Do This Before the First Cold Night
The first cold morning in Sequoyah County always sneaks up on somebody. It’s 85 on a Tuesday, then a front comes through and it’s 41 at daylight on Friday. You bump the thermostat to heat for the first time since March, the air from the vents feels lukewarm, the little AUX light comes on, and you wonder if something’s wrong. Most of the time nothing is wrong. But a heat pump that’s been cooling nonstop since May deserves a few minutes of attention before you ask it to switch jobs.
A lot of homes around Sallisaw are all-electric on co-op power, and the heat pump is doing both halves of the year. Here’s what you can do yourself this weekend, and what’s better left to us.
Clear the Outdoor Unit
Walk out and look at it. Summer grass clippings, cottonwood fluff, and the first leaf drop pack into the coil fins and choke airflow. Shut the power off at the disconnect, then rinse the coil gently with a garden hose. No pressure washer, and spray from inside the cabinet outward so you push the debris out instead of packing it deeper into the fins. Pull weeds and trim shrubs back at least two feet on every side. If the unit has sunk into the ground on one corner so it’s leaning, note it. In heating mode the unit produces water during defrost, and it needs to drain away, not pool in the base and freeze.
Change the Filter and Open the Returns
A heat pump moves a lot of air, and heating mode is less forgiving of a starved return than cooling is. Put in a fresh filter. Then walk the house and make sure furniture, rugs, and the dog bed haven’t crept over the return grilles since spring. Supply vents should be open in every room, even the ones you don’t use, because closing them raises pressure in the ducts and makes the system work harder, not less.
Set the Thermostat Like a Heat Pump, Not a Furnace
This is the one that costs people money every winter. A heat pump makes heat slowly and steadily, and the air out of the vents is warm, not hot. It’s normal for supply air to feel cooler than your hand. Do not crank the thermostat up ten degrees to hurry it along. On most thermostats a big jump kicks on the auxiliary electric strips, which is the expensive way to heat a house. Set it where you want it and leave it. If you use a setback at night, keep it small, two or three degrees, so recovery doesn’t call for aux heat. And know the difference between AUX, which comes on by itself when needed, and EMERGENCY HEAT, which locks out the heat pump entirely and should only be used if the outdoor unit is down.
Test Heat Mode on a Mild Day
Don’t wait for the cold front to find out. Pick an afternoon in the 60s, switch to heat, set the thermostat a couple of degrees above room temperature, and let it run for fifteen minutes. The outdoor fan should spin, the indoor blower should run, and the air from the vents should be noticeably warm. Listen for grinding, clanking, or a loud hum from outside. If the house doesn’t warm at all, or the outdoor unit doesn’t come on, that’s a call to make now rather than in November.
Check the Drain and the Pad
The condensate drain that’s been carrying water all summer can be full of algae by September. Pour a cup of water down the drain line access to be sure it flows. Look at the pad the outdoor unit sits on. Around Sallisaw the ground moves with the wet and dry seasons, and a tilted unit strains the compressor and lets defrost water collect where it can freeze around the base.
Know Your Backup Heat
Every heat pump has a backup, and it’s worth knowing what yours is before the first single-digit night. In most Sallisaw homes it’s electric strips inside the air handler. In some rural places it’s a dual-fuel setup with a propane furnace that takes over when it gets cold enough. If it’s propane, check the tank level now, because the delivery trucks get busy in December. If it’s electric strips and your bill spikes every January, that’s usually a sign the heat pump isn’t carrying its share, and it’s worth a look.
🛠 What we do: A fall heat pump tune-up picks up where your checklist stops. We check refrigerant charge in heating mode, test the reversing valve and the defrost control, confirm the auxiliary heat strips are pulling the right amps and only when they should, tighten electrical connections, measure temperature rise, and clean what you can’t reach. If something’s on its way out, you’ll hear about it now, when it’s a scheduled repair instead of a cold-night emergency. Ask about our maintenance plan if you’d rather not think about spring and fall tune-ups every year.
Why does my heat pump run so much longer than my old furnace?
Because that’s how it’s designed. A furnace blasts hot air in short bursts. A heat pump runs longer at a lower temperature. Long, steady cycles on a cold day are normal. Nonstop running on a mild day is not.
Should I cover my outdoor unit for winter?
No. It needs to run all winter, and a cover traps moisture and blocks the airflow it depends on. Just keep leaves and snow clear of it.
Is steam coming off the outdoor unit a problem?
Usually not. In cold, damp weather the unit goes into defrost for a few minutes and melts frost off the coil, which makes steam. It should clear on its own. Thick ice that stays for hours is a different story.
Get Ahead of the Cold in Sallisaw
Clark HVAC is family-owned and based in Spiro, about a half hour down the road. Run the checklist, and if anything looks or sounds wrong, call us while it’s still shorts weather. Same-day service when we can get to you, and honest answers about whether it’s a fix or a nothing.
📞 Call Now: 918-839-3734
Straight answers. Fair pricing. Clean work.