A phone call we get every fall from Sallisaw goes something like this: “We bought my grandmother’s old house. There’s a gas heater in the hallway wall, a grate in the floor, and window units in the bedrooms. What should we do?” Sallisaw has plenty of these homes, solid frame and brick houses near downtown and out on the edges of town, built long before central heat and air was standard. There isn’t one right answer for an older house, but there are four common paths, and knowing them before anyone quotes you makes the decision a lot easier.
What You’re Probably Working With
Wall furnaces. A gas heater built into an interior wall, often in the hallway, heating the house by natural airflow or a small fan. They’re simple and they work, but the rooms at the far ends of the house stay cool, and older ones may not have the safety controls newer equipment does.
Floor furnaces. A grate in the floor, usually in a central hallway, with the furnace hanging in the crawlspace below. Same idea as the wall furnace, same uneven heat, and the grate gets hot enough to burn bare feet and small hands.
Window units for cooling. Fine for one room, loud, and expensive to run several at once through a long Oklahoma summer.
No ductwork. That’s the real issue. Without ducts, there’s no simple way to move conditioned air from one central system to every room.
Path One: Replace the Wall or Floor Furnace Like for Like
If the house is small, the layout is open, and you’re comfortable with how it heats now, replacing an old wall furnace with a new one is the simplest and least expensive path. A new unit brings modern safety controls and better efficiency. It doesn’t fix the cold back bedroom or do anything for summer cooling.
This is also the most common answer for a rental or a house you’re not planning to keep long.
Path Two: Ductless Mini-Splits
Mini-splits are heat pumps with indoor heads mounted on the wall in the rooms that need them, connected to one or more outdoor units. No ductwork needed. They heat and cool, and each room can have its own temperature.
They’re a good fit for older homes because nothing gets torn out to install them, just a small hole through the wall for each line set. The trade-off is the look of the indoor heads on the wall, and on the coldest mornings some older homes with little insulation may want the old wall furnace kept as a backup.
Path Three: Add Ductwork and a Central System
If you want one thermostat and air coming out of every room, the house needs ductwork. In an older Sallisaw home, that usually means running it through the crawlspace with floor registers, or through the attic with ceiling registers, depending on what the house has room for.
A central system can be a gas furnace with an air conditioner, or a heat pump with an air handler. It’s the biggest project of the four, and it raises questions older houses always do: where the furnace or air handler will live, whether the crawlspace has enough clearance, and whether the attic is insulated.
Path Four: A Packaged Unit Outside
When there’s no good spot inside for equipment, a packaged unit puts everything in one cabinet outside on a pad, with ducts running into the house through the crawlspace. It saves a closet, which matters in a small older house.
What Older Houses Throw at Us
Electrical service. Many older homes have smaller electrical service than today’s houses. A heat pump with electric backup strips, or several mini-splits, may need a panel check or upgrade. We look at the panel on the first visit.
Gas lines and venting. An old wall furnace vents through its own flue. If it’s removed, that flue has to be properly closed off. A new gas furnace may need a new vent route.
Old duct insulation. If the house has pieces of very old ductwork wrapped in a white or gray tape or paper, don’t tear it out yourself. Some older materials need to be checked before they’re disturbed.
Insulation and air leaks. No heating system makes up for an attic with no insulation. Sometimes the best first dollar goes there.
🛠 What we do: we walk the house, the crawlspace, and the attic, look at the panel and the gas line, and then lay out the paths that actually work for your home, with the trade-offs for each. You pick. We don’t push the biggest job when a smaller one fits.
What Waiting Costs
An old wall or floor furnace that’s still lighting isn’t an emergency, but it’s worth a safety check every fall, and a working carbon monoxide detector near the bedrooms is a must with any gas heat. If the window units are on their last summer, planning the replacement in fall beats doing it in a July heat wave.
Do I need ductwork to get central air in an older home?
For a traditional central system, yes. Mini-splits are the no-duct alternative.
Do I need to remove the old floor furnace?
Not always right away, but if it’s staying unused, the gas should be properly shut off and the grate covered or removed safely.
Do I need a bigger electrical panel for a heat pump?
Sometimes. It depends on your current service and what the new system needs. We check that up front.
The Right Heat for Your Older Sallisaw Home
Clark HVAC is family-owned, licensed and insured, and based just down the road in Spiro. We work on older homes across Sequoyah County, and we’ll give you straight options with the price before any work starts. 0% financing is available on installations, so the right fix for an older house doesn’t have to wait.
📞 Call Now: 918-839-3734
Straight answers. Fair pricing. Clean work.