No Heat in Your House?
Cold house, silent vents, thermostat asking for heat that never comes. Before you wait on hold with anyone — us included — run these five checks. About a third of no-heat calls end with one of them.
Quick Answer
Total no-heat usually comes down to one of five things: the thermostat (wrong mode or dead batteries), a tripped breaker or flipped furnace switch, a filter so clogged the furnace locked itself out, a gas supply or pilot issue, or a safety lockout after several failed ignition tries. Everything past those five is technician territory — and in a Central Arkansas cold snap, it's a same-day call.
Check yourself: thermostat, breaker, filter, gas valve, reset | Call now: gas smell, breaker that re-trips, CO alarm, or nothing works
The 5 Checks, In Order
1. Thermostat: mode, setpoint, batteries
Confirm it's set to HEAT (not COOL or OFF), the setpoint is above the room temperature, and the fan is on AUTO. If the display is blank or dim, replace the batteries — a dead thermostat is the cheapest no-heat fix in Arkansas. Give the system five minutes after any change; many have a built-in restart delay.
2. Breaker panel and the furnace switch
Find the furnace's breaker and make sure it hasn't tripped — flip it fully OFF, then ON. Also check the light-switch-looking toggle on or near the furnace itself; it gets bumped in closets and attics more often than you'd think. Gas furnaces still need electricity to run. If a breaker trips again after one reset, stop — that's an electrical fault, not a nuisance.
3. The filter — yes, really
A filter packed with a season of dust starves airflow until the furnace overheats and shuts itself down, sometimes into a hard lockout. Pull it: if you can't see light through it, swap it, then cut power to the furnace for 30 seconds to clear the lockout and let it retry.
4. Gas supply and pilot
Check that the gas valve on the line to the furnace runs parallel to the pipe (open), and that other gas appliances work. Older furnaces: relight the standing pilot per the label instructions. If the pilot won't stay lit, or you smell gas at any point — stop immediately, leave the house, and call the gas company before you call us.
5. One reset, then stop
Cut power at the switch or breaker for 30 seconds and restore it. Modern furnaces lock out after three failed ignition attempts; a reset gives it three more. If it clicks but never lights, runs a minute and dies, or does nothing at all — that's an igniter, flame sensor, control board, or inducer motor, and continuing to force retries just wears parts. Make the call.
While you wait for help — heat the house safely
Space heaters go on the floor, three feet from anything that burns, plugged straight into the wall — never a power strip. Never heat with a gas oven or grill; that's how carbon monoxide ends up in living rooms every Arkansas cold snap. Close off unused rooms, let faucets drip if it's below freezing, and if anyone in the house gets a headache or nausea alongside the no-heat, get out and call 911 — CO is odorless. If your system is a heat pump wearing a shell of ice, see Heat Pump Frozen Over? — and if it runs but blows cold, start at Furnace Blowing Cold Air.
Heat not working but the AC works? Fan runs but the air is cold?
These two are the most common ways people describe a no-heat call, and each one narrows the problem down before anyone opens a panel.
The AC works but the heat does not
Good news first: the thermostat, the blower, and the power to the system are all fine, because cooling uses all three. The failure is in the heating stage only. On a gas furnace that means the ignition sequence: an igniter that never glows, a flame sensor too dirty to prove the flame, a pressure switch that will not close, or a tripped rollout or high-limit switch. On a heat pump it usually means the reversing valve is stuck on the cooling side or the defrost board is not switching modes, so the outdoor unit runs and the air comes out cool. One more spot worth a look: the thermostat wire for heat (the W terminal on a furnace, O/B on a heat pump) can loosen or lose its setting after a thermostat change, and the heat call never reaches the equipment.
The fan runs but the air is cold
First check the thermostat fan setting. On "ON", the blower runs all day whether there is heat or not, and the air feels cold between cycles; set it to "AUTO". If it is already on AUTO, a furnace blower running with no heat usually means the board tried to light, failed, and is running the fan to clear the cabinet before it locks out. That is the furnace blowing cold air pattern, and the flashing light on the board will tell you why. On a heat pump, a few minutes of cool air while the outdoor unit steams is a normal defrost cycle, but cool air for an hour with frost building on the coil is a frozen heat pump. If the strips that back up a heat pump have failed, the air stays lukewarm on the coldest nights, which is the aux heat problem.
Three safe things to try before you call
- Set the thermostat to HEAT (not AUTO), fan to AUTO, and the temperature at least five degrees above the room. Wait a full five minutes; most systems have a built-in delay.
- Heat pump: switch to EMERGENCY HEAT for ten minutes. Warm air means the strips work and the heat pump side is the problem. Still cold means the trouble is at the air handler or the thermostat.
- Gas furnace: turn the power switch on the furnace off for thirty seconds and back on, once. If it tries to light and fails again, stop. Repeated resets are how a small ignition fault becomes a gas-valve call.
If you smell gas at any point, leave the house and call from outside. Otherwise, the thermostat page covers the "says heat on but nothing runs" case, and the blinking-light page decodes what the furnace is trying to tell you.
Is it safe to sleep in a house with no heat?
For a healthy adult, one night in a house that has drifted into the 50s is uncomfortable, not dangerous: layer up, pile on blankets, and sleep in the smallest room with the door closed. The honest answer changes with who is in the house. Infants, anyone over about 65, and anyone with heart, lung, or circulation problems lose body heat faster and may not notice it happening. For them, an indoor temperature below the mid-60s for hours is a reason to move to a relative's house or a hotel for the night rather than tough it out. If we're closed, request service online and we'll call you the next business day.
The house has its own threshold. Once the outdoor temperature sits below about 20 degrees for a stretch, uninsulated pipes in exterior walls, crawl spaces, and attics start to freeze, and a burst pipe costs far more than a furnace repair. Open cabinet doors under sinks on exterior walls and let a faucet drip. In Central Arkansas that usually means a handful of nights a winter, and they are exactly the nights heat fails.
Whatever you do, keep the safe-heating rules above: space heaters on the floor and clear of anything that burns, and never an oven, grill, or generator indoors. A cold night is survivable. Carbon monoxide is not.
Ready for a pro to take it from here?
No-heat calls jump the queue in a cold snap — our office answers Mon–Fri, 9 AM–3 PM, and the truck arrives stocked with igniters, flame sensors, and control boards so heat comes back in one visit, not two. Our heating repair crews run same-day calls across Central Arkansas — including heating repair in Bryant, heating repair in Benton, heating repair in Little Rock, North Little Rock, Conway, Sherwood and Maumelle. Urgent? Same-day heating repair runs Mon–Fri, 8 AM–5 PM. Outside those hours, request service online and we call you the next business day.
Other heating problems we cover: Furnace blowing cold air · Furnace turns on and off · Furnace blinking light codes · Yellow furnace flame · Pilot light keeps going out · Furnace smells like burning · Water around the furnace · Furnace whistling · Heater making a loud noise · Blower hums but won't spin · Heat pump frozen over · Heat pump fan not spinning · Aux heat won't turn off · Thermostat not working · System won't turn on.
Still No Heat? Call Us.
Office answers Mon–Fri, 9 AM–3 PM, $149 flat diagnostic with $75 credited to the repair, and same-day heating repair across Little Rock, Bryant, Benton, Conway, and all of Central Arkansas.
Call 501-307-5959