April is as quiet as it gets here, and even then the house isn’t asking for nothing. Arkansas doesn’t have a true off-season month, so the real question isn’t when to shut everything down for good but when to run the two changeovers well: killing the heat in spring, waking the air conditioner in fall, and handling the stretch in between when a house wants both on the same day.
The quietest month in Arkansas
April is the calmest month on the Arkansas calendar, and it still adds up to about 202 combined heating and cooling degree days. Nationally, the quietest month anywhere ranges from roughly 70 degree days in the mildest states to about 246 in the most demanding ones, so 202 sits well toward the high end of that range, not near the bottom.
Degree days aren’t a temperature. They’re a running measure of how much heating or cooling demand a month generates, tallied against a 65-degree baseline, day after day. A month can average a pleasant 60 degrees and still rack up a real degree-day total if the mornings run cold and the afternoons run warm.
That distinction matters here because 202 degree days in a supposed lull tells you something specific: Arkansas doesn’t get a month where the house genuinely asks for nothing. Compare that number to a state whose quietest month lands near 70, and you’re looking at a place where windows can stay open for weeks with both systems off. Arkansas isn’t that place. Even in its gentlest month, something in the house is still calling for either heat or cooling often enough to add up.
What that means for the shape of the year
Picture the year less as a switch and more as a long slide. Winter holds on stubbornly, cooling only gradually as spring advances, and the changeover into summer arrives more as a handoff than a clean break. Summer itself builds heavily and holds heavily, then eases back into fall in the same gradual way it arrived. There’s no flat stretch in the middle, just a narrower band where the pull toward heat and the pull toward cooling are closest to balanced, and that’s the closest thing Arkansas gets to a pause. It’s brief, and it’s not really empty. That’s the honest read of the number, not a window the data doesn’t support.
Shutting the heat down for the year
The spring shutdown works best as a sequence, not a single flip of a switch. Doing it in order protects the equipment and catches small problems before they turn into an August surprise.
- Stop calling for heat at the thermostat first, rather than cutting power at the breaker or the switch. Let the system respond to the setpoint change on its own.
- Let the system finish whatever cycle it’s mid-run on. Furnaces and heat pumps go through shutdown sequences that shouldn’t be interrupted at the panel.
- For any gas-fired equipment, follow the manufacturer’s guidance on seasonal shutdown rather than shutting off the gas supply or extinguishing a pilot yourself. Modern furnaces have specific procedures, and that’s where the homeowner’s job ends and a technician’s begins if something looks off.
- Change or clean the filter. As ENERGY STAR puts it: “Inspect, clean, or change air filters once a month in your central air conditioner, furnace, and/or heat pump.” That’s a monthly habit, not a seasonal one, and it applies to all three types of equipment, not just furnaces.
- Shut down any humidifier attached to the ductwork. It’s tied to the heating cycle and almost everybody forgets it sits there quietly all summer, still plumbed into a system that’s no longer running.
- Clear the physical area around indoor equipment, vents, and returns, and vacuum out visible dust before the system sits idle for months.
One caution worth stating plainly: Arkansas’s heating season runs roughly seven months, from October into April, which means real winter cold and real freeze risk are part of the picture for most of that stretch. This shutdown sequence belongs at the tail end of that season, once the mean temperature has climbed back above the 65-degree threshold that keeps heating demand low. Shutting the furnace off completely in the middle of a cold snap, rather than at this seasonal changeover, is how pipes freeze.
The first run of the cooling season
The best day to test the air conditioner isn’t the first 95-degree afternoon of the year. It’s a mild day weeks earlier, when a stuck capacitor or a clogged line shows up as an inconvenience instead of a household emergency. Arkansas averages about 69.2 days a year at 90 degrees or hotter, which is exactly why this early test matters here: once that heat load arrives, it doesn’t let up for long.
- Clear leaves, mulch, and debris away from the outdoor condenser unit, and trim back any plants growing into it.
- Check the condensate drain line for clogs or standing water before the system runs for hours at a stretch.
- Change or wash the filter, whichever your equipment uses.
- Run the system in COOL for a full cycle on a mild day, not the first hot one.
- Feel the air at a register farthest from the unit, not the closest one, to confirm cooled air is actually reaching the far end of the house.
ENERGY STAR is direct about why the filter step isn’t optional: “Airflow problems can reduce your system’s efficiency by up to 15 percent.” A system that’s mechanically fine can still underperform badly on a dirty filter alone.
Most of these checks apply directly in Arkansas, where 72% of homes run a central air-conditioning unit and 93% have some form of air conditioning installed. But that gap between those two figures, 21 points, represents homes running individual equipment instead: window units, wall units, ductless mini-splits, or portables, which make up 26% of homes statewide. Those units skip the condensate-line and outdoor-condenser steps above and instead need their filters and intake grilles cleaned directly, plus a check that the unit is still seated and sealed properly in its window or wall opening. Ceiling fans, present in 82% of Arkansas homes, don’t replace any of this but are worth turning on alongside the air conditioner. They let a thermostat run a degree or two higher without anyone noticing the difference.
The days that ask for both
This is the part of the year nobody names but everybody lives through: heat running at six in the morning, cooling running by mid-afternoon, same house, same week. In Arkansas, October is the month where that pattern shows up most clearly, carrying roughly 145 heating degree days and 69 cooling degree days in the same 31-day stretch.
That’s a convention stated here, not a category NOAA publishes: a month counts as asking for both when it carries at least 50 heating degree days and at least 50 cooling degree days. October clears both bars comfortably. It’s not a contradiction in the data. It’s a month where mornings genuinely need heat and afternoons genuinely need cooling, and the thermostat has to be managed accordingly rather than left on one setting.
| Setting | What it does | When it’s the right call |
|---|---|---|
| Manual mode switching | You choose HEAT or COOL by hand each time conditions flip | When mornings and afternoons swing sharply and you’re home to adjust |
| AUTO changeover | The system switches itself between heating and cooling as needed | Convenient, but it runs both systems more often, which costs more over the month |
| Wide deadband between setpoints | A gap of several degrees between the heat setpoint and the cool setpoint | Keeps the system from firing one right after the other on the same swing |
| Open windows | No equipment runs at all | On days when outdoor temperatures actually sit in a comfortable range for hours |
The expensive mistake shows up when the gap between the two setpoints is too narrow. A house heats up in the cold morning, then by afternoon the air conditioner kicks on to cool down the very air the furnace just paid to warm. Widening that deadband, or switching to manual mode during a month like October, is usually the cheaper path.
And the changeover in the other direction
Arkansas’s heating season begins in October, the first month the average temperature at the reference station in Little Rock drops below the 65-degree baseline used to count heating degree days, and it runs roughly seven months before the mean climbs back above that line in May. Demand peaks hard in January, at 754 heating degree days, the highest single-month figure of the year.
The fall version of the pre-season checklist looks a lot like the spring one in reverse: filter change, a look at the vents and registers, and a first heating run on a cool but not yet cold day. What differs is which piece of equipment gets the attention. In Arkansas, 60% of homes rely on a furnace as their main heating equipment and 19% run a central heat pump, while the survey doesn’t publish a usable figure for steam or hot-water boilers in the state, which isn’t the same as saying no home has one. Natural gas serves 43% of homes and electricity 46%, with propane covering another 4%. That mix points toward a furnace-and-filter routine for most Arkansas households rather than the radiator bleeding and boiler pressure checks that matter in a boiler-heavy state. The detailed fall checklist belongs on this site’s heating-season guide, and this is the point in the year to go find it.