January in a Suburban Heights garage: heater, mini-split, or nothing at all
The freeze window opens the first week of December. That is when the garage woodworkers, the home-gym people and the folks with a second fridge full of game-day food start calling.
The first week of December
A retired UF facilities electrician in Suburban Heights, a quiet neighborhood of long-time owners near HCA North Florida hospital, has a two-car garage he has used as a woodshop since the kids left. For nine months a year the overhead door stands open and a box fan does the job. Then the freeze window opens, the National Weather Service issues its first frost advisories for Alachua County, and on the first 31-degree morning the shop is unusable until ten. He calls to ask about a garage heater. That call, and ones like it from home gyms in Blues Creek and detached shops out toward Archer and Jonesville, is the entire Gainesville market for this product.
Three answers, and which one we gave him
Nothing. If the garage is used for parking and storage, skip it. Seventeen freeze nights and a few dozen chilly mornings do not justify equipment, and a space heater on a timer handles a one-off project.
A garage heater. A unit heater, gas-fired where GRU gas reaches the house or electric where it does not, mounted at the ceiling and aimed down the length of the shop. It heats fast, costs the least to buy, and does nothing from March to November. It is the right call for a workshop used mainly in cool weather, especially one with sawdust that would foul a mini-split’s indoor coil.
A ductless mini-split. A small heat pump with a wall head in the garage. It heats on freeze mornings and, more to the point, cools the space on August evenings when the door is shut against the mosquitoes. It costs more up front and earns it in a gym, an office, or a shop someone uses year-round.
For the woodworker we recommended the gas unit heater. His house is inside GRU’s gas territory, the shop is a cool-weather hobby, and the sawdust decided the rest.
The morning we hang it
The visit starts with the garage itself: panel capacity, the existing gas line and meter, ceiling height, and where the car and the water heater sit, because code keeps ignition sources a set distance above a garage floor. The heater mounts to the ceiling joists in the corner opposite the overhead door. A gas unit gets a new line, a shutoff, and a sealed vent through the wall or roof; an electric unit gets a dedicated circuit. The thermostat goes on the wall near the people door, not behind the lumber rack. Start-up, a combustion check on gas units, and a carbon monoxide detector finish the job. Most garage heater installs are done in a morning.
Running a shop at 55 degrees
Set it low. A shop that holds 55 degrees on a 28-degree morning is comfortable in a sweatshirt, and the unit will barely run. Keep the area under the heater clear of the plywood stack, and if the garage is attached, remember that the house’s air handler closet or attic hatch may share that space; we seal those penetrations so the shop heat and the sawdust stay in the shop.
One maintenance visit a year, in November before the first frost, covers the burner, the fan and the vent. Dust is the enemy: a gas heater in a woodshop should have its burner compartment blown out before every season.
Who this product is not for
Student rentals near campus, homes in Oakmont or the Town of Tioga whose garages hold cars, and anyone whose real complaint is a hot garage in July. We would rather sell those people a mini-split, or nothing, than a heater that runs twenty mornings a year.
Garage heating questions from around I-75
How many mornings a year would a Gainesville garage heater actually run?
On the long-term count, about seventeen nights fall to freezing and perhaps forty more are cold enough to notice in an uninsulated garage. Call it two months of occasional mornings. That is why we steer most people toward equipment that also cools in August.
Is a ductless heat pump better than a heater for a garage gym off Millhopper Road?
For a gym, almost always. You will use the space far more on 92-degree July evenings than on 30-degree January mornings, and a mini-split does both. A dedicated heater only wins when the space has no cooling need, like a woodshop used in cool weather.
Can a heater go in a garage that holds a car and a gas water heater?
Yes, with the right unit and placement. Code requires ignition sources in a garage to sit above a set height off the floor, and a fuel-fired heater needs combustion air and a vent. We handle placement and venting as part of the install.
Does GRU gas reach my garage, or is a heater going to be electric?
If your house has GRU gas, extending a line to the garage is usually practical. Outside the gas territory, in Clay Electric or municipal electric areas, an electric unit heater or a mini-split is the answer. We check the meter and the panel on the estimate.
Cold garage this winter?
Call and describe how you use the space; we'll tell you which of three answers fits.