Last winter, our office wing used 28% less electricity for heating than the previous winter. It wasn't one dramatic fix. It was a Daikin 1 ton heat pump, a Daikin One smart thermostat, a ceiling fan, and one important change in how I think about heat.
I manage purchasing and facilities for a four-location restaurant group in the Southeast. For six years, I've watched our utility bills, service invoices, and comfort complaints pile up. The short version of what I learned: when you heat a small commercial space, heat the zone where people are; don't pay to condition the whole building at once. The 28% came from that principle more than from any single product.
When I first started this role, I thought cold rooms simply needed more heat. I nearly approved an oversized heat pump for our 550-square-foot office wing before a contractor talked me out of it. He did a real load calculation and specified a Daikin 1 ton heat pump. My instinct said too small. The math said otherwise.
A 1-ton unit moves about 12,000 BTU/h. For that space, on the coldest days we see, it's enough. Install something much larger and the room reaches the setpoint quickly, then the system shuts off and the space feels drafty. The inverter compressor in our Daikin unit runs at lower speed for longer periods, so the temperature stays steady and the energy draw stays modest.
The thermostat was the second fix
The heat pump alone would not have cut our bill by 28%. The office used to be controlled by whoever arrived first: one person set it to 74, another turned it down, and nobody changed it on weekends. Some nights we heated an empty office to 74 degrees. Some Monday mornings we walked into a cold room because someone had lowered the thermostat on Friday and no one raised it back.
We replaced the controls with a Daikin One smart thermostat and set a basic schedule: 68°F on weekdays from 7:30 AM to 6:30 PM, and 60°F the rest of the time. This is not clever technology; it just stops paying to heat empty chairs. The thermostat also shows energy history, which made the results easier to explain to our owners than a stack of utility bills.
A $129 ceiling fan? Yes.
The fix that felt too simple to matter was the ceiling fan. The office wing has an 11-foot ceiling, and warm air collects near the top. One morning I measured 66°F at the floor while the thermostat at chest height read 68°F. The heat wasn't missing; it was above our heads.
Our contractor installed a basic ceiling fan and set it for winter mode: low speed, reverse rotation. That gently moves warm air down from the ceiling without creating a cooling breeze. Within about an hour, the temperature difference between the floor and ceiling shrank to about 2°F. People stopped layering jackets indoors, and the heat pump's thermostat stopped being fooled by warm air at the ceiling.
Patio heaters are the deliberate exception
Not every heating problem is inside. If you manage a restaurant or a commercial site with outdoor seating, you already know: no heat pump can heat the open sky. The solution we use on our patio is not an efficiency upgrade; it's a revenue decision.
We run two propane infrared patio heaters at our flagship location. They radiate heat directly to people and surfaces instead of trying to warm the air. At current propane prices in our area (as of January 2025), each one costs roughly $1.30 to $2.10 per hour on high, depending on the supplier. That is not cheap, but it's cheaper than closing the patio on a 60°F afternoon. The fuel cost is covered by the first table that sits out there.
The savings came from small rules: light a heater when the first party sits down, turn it off when the last one leaves. I've watched heaters burn all afternoon for two customers midweek. That's the same as leaving a cash register open.
The kitchen analogy that explains heat pumps
Here's a mental model that helped me. Our pastry chef once asked me to order a double boiler, and I had to look up how to make a double boiler. The short method: put an inch or two of water in a saucepan and bring it to a simmer. Set a heat-safe bowl over the pan so the bottom doesn't touch the water. The steam transfers heat to the bowl gently, without scorching the contents.
A heat pump is doing something similar with refrigerant. It doesn't create heat by burning fuel or running electric resistance coils. It uses electricity to move heat from one place to another: refrigerant picks up heat outside, carries it through the loop, and releases it inside. Because it's moving existing heat instead of making it from zero, it can deliver more heat per kilowatt-hour than a resistance heater in our climate.
The U.S. Department of Energy says air-source heat pumps can reduce electricity use for heating by about 50% compared with electric resistance heating (energy.gov, accessed January 2025). The exact number depends on your climate, your building, and your utility rates. Our 28% whole-wing figure includes the heat pump plus the thermostat, ceiling fan, and old habits we finally fixed.
Where this approach falls short
I'm not an engineer, and this isn't a recipe that fits every building. A few conditions have to be true:
- The envelope has to be decent. If your building leaks air, even the best heat pump will struggle. Seal obvious gaps and add insulation first.
- Get a load calculation. Not a guess from a salesperson. A proper heat-load calculation determines what size equipment you actually need.
- You need predictable occupied hours. Our set-back savings depend on the office being empty for roughly half the week. A 24/7 building won't see the same results.
- Very cold climates are a different conversation. Standard air-source heat pumps lose capacity as outdoor temperatures fall. Look for cold-climate rated equipment and check the backup heat plan.
- Outdoor heaters are not indoor heaters. Follow clearances and check local codes, especially if the space is covered or enclosed.
If you're looking at a quote right now, ask for the calculated load, the thermostat schedule, and the plan for air movement. The answers will tell you more about your future heating bill than the brand name on the equipment. That's the real lesson from our 28%.
