How to Set a Honeywell Home Thermostat Temperature — Without Overspending on Garage Heaters and Fans

The First Question Isn't Temperature

As a procurement manager at a 35-person industrial distribution company, I've spent the last six years approving every invoice that touches our building's comfort: thermostats, garage heaters, fans, and the occasional HVAC service call. In that time, I've learned that when someone asks how to set a Honeywell home thermostat temperature, they expect a single number. The honest answer is: it depends. Not because that's a consultant dodge, but because the right setting for a busy office is wrong for a drafty garage and useless for a mixed-use building.

Sort Out Your Comfort Scenario First

Most comfort problems fall into one of three scenarios. If you answer which one is closest to your building, the decision gets a lot easier.

• Predictable hours: offices, storefronts, and workshops where people work roughly the same schedule five days a week.
• High-ceiling or open-door spaces: garages, loading docks, and warehouses where heat rises and doors open all the time.
• Mixed-use or erratic schedules: buildings with zones that function differently, weekend work, or frequent schedule changes.

Scenario A: Predictable Hours — Use a Schedule, Not a Fixed Temperature

If you have a standard business routine, the biggest waste is a thermostat left at the same temperature all day. We did that for a full winter before I looked at the gas bill. To be fair, a constant temperature is simple, and it avoids complaints. But you're paying to heat rooms that have been empty since 6 p.m.

On most Honeywell home thermostats, the programming path is Menu > Schedule. The Honeywell thermostat app does the same thing with a much clearer seven-day view. I prefer the app because I can spot a 6 a.m. start time that nobody actually needs. In our building, changing the morning start from 6 a.m. to 7:45 a.m. cut about $1,400 from our annual heating bill. That's not a guess; it's in the cost tracking sheet.

Here's the part that goes against conventional cost-cutting advice: don't make the setback extremely deep. I used to set our night temperature to 55°F. The HVAC tech told me not to go below 60°F. I didn't listen. After our 2023 cold snap, the recovery load sent the furnace into a nearly nonstop run from 5:30 to 7 a.m. Total energy use for those days was higher than when we used 62°F. A shallow setback of roughly 5°F is usually enough for an older building, even though the U.S. Department of Energy (energy.gov) says a 7°F–10°F setback for eight hours can cut heating and cooling costs by up to 10%. The actual building should set the limit, not a generic rule.

If you're still wondering how to set Honeywell home thermostat temperature, the simple version is: set occupied times to real working hours, set unoccupied times to about 60°F in winter, and don't turn the system off entirely. Off leaves the building too cold too fast, and the recovery cost will be worse.

Scenario B: Garage or Workshop — Size the Heater, Then Move the Air

Garages are different from offices. The ceiling is higher, the doors are bigger, and the insulation is usually minimal. That means a Honeywell thermostat in the office has almost nothing to do with the temperature in the shop. You need a separate garage heater and a different approach.

In 2024, when we replaced the heater in our 1,200 sq ft insulated workshop, three local suppliers gave us quotes. The first two recommended a 75,000 BTU unit. A third contractor measured the building and recommended a 45,000 BTU unit. The 75,000 BTU unit cost $410 more and would have short-cycled: heat the air fast, shut off, let the floor stay cold, then repeat. The 45,000 BTU unit cycles less frequently and keeps the concrete warmer. That's the total cost of ownership difference no one sees on a sticker price.

You also want air movement. Heat stratifies, so the ceiling in a garage can be 10°F warmer than the floor. We tested a Honeywell high-velocity fan and a Shark fan on a low setting. The Honeywell moved more air; the Shark fan had a better tilting base for aiming at a workbench. I have mixed feelings about using consumer-grade fans in a commercial shop—part of me wants industrial stamped metal. But a fan that moves air is a fan. Buy whichever one fits the mounting setup.

Now the wiring part. How to wire a thermostat for a garage heater depends on what you're heating. Electric heaters run on line voltage (120V or 240V) and need a line-voltage thermostat. Gas heaters use a low-voltage thermostat, similar to what controls a furnace. In 2024, our maintenance guy grabbed a line-voltage thermostat from the shop shelf and installed it on a gas unit. It shorted the control board and cost us $220 in parts and a service call. Read the label on the heater before you buy anything.

If you want phone control, check compatibility before you assume the Honeywell thermostat app covers a garage heater. In many cases, a line-voltage garage heater has no Wi-Fi thermostat, and that's okay. A plain manual thermostat is fine for a space that's used on a predictable schedule.

Scenario C: Mixed-Use Spaces — Let the App Handle the Chaos

Some buildings are a combination of everything. The front office runs from 8 to 5, the back shop starts at 6, and the loading dock gets used every other afternoon. For that pattern, a single thermostat is the wrong control. The Honeywell thermostat app is the right layer on top, but you still need zones or remote sensors to make it work.

We set up two programs in the app: the office at 70°F from 8 a.m. to 4:30 p.m., and the shop at 60°F from 6 a.m. to 3 p.m. If a delivery gets canceled, I can adjust the shop schedule from my phone and not pay to heat an empty space. That's exactly the kind of efficiency that reduces both cost and wasted time.

But app access comes with a lesson. We gave too many employees the password, and someone changed the office setpoint to 74°F for a cold afternoon and never changed it back. The building stayed at 74°F for the whole weekend. The app doesn't solve every problem, but it does make the schedule visible—and visible is easier to control. Keep app credentials to two people and lock the thermostat so manual changes require the pin.

If your zones don't have separate thermostats, consider a remote sensor. Some Honeywell home thermostats support wireless sensors, and that solves the old problem of the thermostat near a sunny window controlling the whole office. The sensor measures the room where someone actually sits.

How to Tell Which Scenario You're In

Walk the building at 3 p.m. and again at 9 p.m. Note which rooms are used, when the last person leaves, and how often the big doors stay open. Then look at your heating source. A heat pump with auxiliary resistance heat does not recover from a deep setback as efficiently as a gas furnace, because the backup heating elements draw a lot of current. A gas furnace can recover more quickly, but the recovery time still matters in an old building.

Track the numbers. It took me six years and more than 200 invoices to understand that the cheapest first cost is rarely the cheapest total cost. The $240 we saved on that garage heater quote disappeared when the limit switch failed and the labor cost piled on. The vendor who asks about wiring and insulation is worth more than the one who just wants to move a box.

The Bottom Line

There is no universal answer to how to set a Honeywell home thermostat temperature, pick a garage heater, or choose a fan. The correct move is to figure out which scenario you're in, then apply the matching advice: schedule setbacks for regular hours, size the garage heater properly and add a fan, and use the app plus zoning for mixed schedules. If you do that, you stop paying for comfort that nobody is there to feel.

Pricing and equipment recommendations here are based on my own quotes and purchases as of early 2025. Verify current pricing and local wiring codes before ordering anything.