Heating a Jacksonville garage: what it costs for the dozen nights it earns its keep

What a season of garage heat actually costs

Start with the calendar, because it is the whole argument. Jacksonville’s first freeze usually comes in early December. Across a normal winter there are around fourteen nights at or below 32 and three at or below 26, scattered between December and February. Daytime highs even in January climb back into the 60s.

So a garage heater here runs on perhaps a dozen to twenty mornings a year, and on most of those for an hour or two before the sun and the slab catch up. An electric unit heater sized for a two-car garage draws real power while it runs, but it runs so little that the season’s cost on a JEA bill is modest: a line item you would notice if you looked for it, not one that changes the total.

The upfront cost is the larger number, and it is also modest compared with any whole-house equipment. The question is not whether you can afford it; it is whether the space is used enough on cold mornings to make it worth owning.

Is it loud enough to hear in the kitchen?

Unit heaters have a fan, and the fan is the only sound. In an attached garage on a 1990s Mandarin or Southside house, the sound through a fire-rated door and a shared wall is comparable to a bathroom exhaust fan running next door: audible if you listen, forgotten in a minute. Infrared radiant panels are silent, heat objects rather than air, and suit a workbench or a gym corner better than a whole bay.

For a detached shop out toward Baldwin or Bryceville, noise is irrelevant, and a larger forced-air unit mounted at the ceiling is the simple choice.

Will heating the garage make it damp?

This is the question that actually matters in Duval County, and the answer depends on the fuel. An electric heater adds no moisture. An unvented propane or natural gas heater adds water vapor as it burns, and in a closed garage on a damp December morning that moisture lands on the coldest surfaces: tools, the car, the slab. Rust follows. We do not install unvented gas heat in garages for that reason, and we steer gas-garage owners toward a sealed, vented unit if they insist on gas at all.

Heat alone also does nothing for the summer, when the garage is the dampest room on the property. If humidity in the space bothers you from June to September, the fix is a mini-split or a dehumidifier, not a heater.

What does it do to the air in there?

An electric heater moves and warms the air that is already present. It does not clean it, and it will stir up sawdust in a workshop, so a filter on the intake or a separate air cleaner is sensible for anyone running a table saw. Gas units, again, need venting and a carbon monoxide detector by code and by common sense, especially in a garage attached to living space. Our installs put the detector in before the heater goes on.

Ask about a garage heater

Who in Duval County should buy one

• The woodworker, mechanic or home-gym owner who is in the garage on winter mornings regardless of the temperature.
• The detached-shop owner in Baldwin, Callahan or the rural Nassau and Baker lots, where the shop is a workplace.
• Anyone storing something temperature-sensitive who needs the space to stay above a set point on hard-freeze nights.

Who should not: the homeowner whose garage holds two cars and a lawnmower. For that garage, the dozen cold mornings pass unnoticed and the heater would too. We would rather tell you that on the phone than install something you turn on twice.

Electric unit heaters, radiant panels and ductless mini-splits are what we install for garage spaces; ask which specific lines Cook’s stocks. [[CONFIRM WITH JERRY]] Free estimates, financing with low monthly payments, and no after-hours charge if we end up out there on a cold Saturday.