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What to Check Before the Heat Goes On for the Season
You reach for the thermostat on the first cool morning, switch it to heat, and something smells like a dusty attic. Maybe nothing happens at all. That first run of the season is where most heating problems show up, because the system sat unused for months. Here is what to check yourself, and what to call us for before the cold settles in.
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From the technicians at King Air & Heating
What the off-season does to a heating system across our service area
In most of Florida the heat side of the system runs a handful of weeks a year, and that idle time is the problem. Blower wheels collect dust, contactors pit, and heat strips in an air handler sit in humid air until they corrode. Outdoor heat pump coils take salt air all summer, so the reversing valve and defrost controls get their first real workout in November with a year of grit on them. Gas furnaces in the northern part of the region have their own list, mostly ignition components and flue draft. None of this is dramatic. It is just wear that stays hidden until you ask for heat.
Which failures spike, and when
The first cool snap brings a wave of no-heat calls, and the pattern repeats every year. Week one is thermostats: dead batteries, a setting left on cool, a wire that came loose during summer. Weeks two and three are heat strips and sequencers in air handlers, usually one strip out of three burned open so the house warms slowly and never quite gets there. Heat pumps show up next with defrost board and reversing valve trouble, often after a damp night. Gas furnace calls cluster around igniters and flame sensors. Late season we see blower motors that ran hard all summer and gave up under winter load.
The pre-season checks worth doing yourself
Start with the thermostat. Fresh batteries, mode set to heat, and a setpoint a few degrees above room temperature so it actually calls. Then change the filter. A restricted filter is the single most common reason a system short cycles or trips on high limit, and it costs you almost nothing to rule out. Walk to the outdoor unit and clear leaves, mulch, and vine growth back a couple of feet on all sides, since a heat pump needs that airflow in heating too. Inside, open every supply and return vent, including rooms you keep shut. That is the safe list. Anything involving gas, refrigerant, or line voltage is ours.
Run the heat before you need it, and listen
Pick a mild afternoon and run the heat for fifteen or twenty minutes with the windows open. A faint burning smell for the first few minutes is dust cooking off and it should fade. If it keeps going, or smells sharp and electrical, shut the system down and call us. Put your hand at a supply vent. Air should feel clearly warm, not lukewarm, and it should stay warm rather than fading in and out. Note any grinding, squealing, or a hum that starts and stops. Doing this in October means you are calling us on your schedule instead of during the first cold night.
If you ever smell gas or suspect carbon monoxide
Leave the building first. Take everyone outside, do not flip switches or use the thermostat, and once you are out, call 911 or your gas utility from a safe distance. Then call us and we will come look at the equipment. Same order if a carbon monoxide alarm sounds: outside, emergency call, then us. Do not try to find the source yourself and do not restart the system to test it. Working carbon monoxide alarms on every level are worth having if you burn any fuel in the house, and test them when you do your pre-season heat run.
What to Check Before the Heat Goes On for the Season — straight answers
Why does my heat smell like burning the first time I turn it on?
Usually dust burning off heat strips or a heat exchanger after months of sitting. It should fade within a few minutes with the windows open. If it lingers or smells sharp and electrical, shut it off and call us.
My heat pump is blowing cool air. Is it broken?
Not always. Heat pumps deliver air cooler than a furnace does, and they run in defrost cycles that briefly feel cold. If the air never feels warm at the vent or the house will not hold temperature, have us check it.
When should I schedule a heating check?
October or early November, before the first cool snap fills the schedule. That gives time to order any part your system needs without you sitting in a cold house waiting for it to arrive.
How it works
- Step 1
Tell us the symptom
Call or fill in the quote form and describe what changed. Warm air, short cycling, a breaker that keeps tripping, water stains on the ceiling. That detail helps us bring the right parts.
- Step 2
We diagnose on site
A technician checks the thermostat, the electrical side, refrigerant performance, airflow and the condensate line. We find the actual cause instead of swapping parts and hoping the problem stays away.
- Step 3
You approve the repair
We explain what failed, what it takes to fix it, and how long the part is likely to last. Nothing gets replaced until you say go, and we test the system before leaving.
- A real person answers
- Open 7 days
- Written quote before work starts
Why homeowners call us
- Built for the salt airCoastal Florida is hard on outdoor equipment. Coils corrode, contactors pit, fan motors seize early. We look for that damage during every air conditioning repair so a small failure does not take the whole system down.
- Condensate lines we actually clearBy late summer, drain lines clog with algae and shut systems off on the float switch. We clear the line, check the pan and the safety switch, and show you what caused the backup.
- Heating tooCold snaps still arrive. We do heating repair and heater repair on heat pumps, strip heat and furnace repair where homes have one, so the system works in January as well as August.
- Plain talk about older systemsIf a repair makes sense, we repair it. If a unit is failing in ways that will keep costing you, we say that too and lay out the options. You decide, not us.
- All major brands, gas & electricEvery major HVAC brand, gas and electric, handled by an independent crew.
- Straight answersWhen a replacement beats a repair, we tell you, sometimes before we roll a truck.
About this guide
Safe checks done and it still misbehaves? That's a real fault
Mention which checks you ran when you book; it speeds up the visit.
- A real person answers
- Open 7 days
- Written quotes
- All major brands
- Gas & electric
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