The Best Garage Heaters and Why They're Beneficial

December 27, 2017

garage furnace diy

3 Reasons You Need Deserve a Heated Garage

Finish Your Projects Faster

Having a garage furnace means you won't have to wear a hat and gloves when you're out working on your hobbies and other projects. You'll also be less likely to postpone projects just to avoid the cold.

Increase Your Storage Space

Heating your garage allows you to store more temperature-sensitive items, such as clothing, books and leather furniture.

Protect Your Car

In a heated garage, your car's oil stays warm and fluid, so it does a better job protecting the engine. Your coolant also stays warmer, helping your car's interior warm up faster.

Best Garage Heaters

For several reasons, extending ductwork into your garage isn't the optimal way to heat the space. You need to have balanced air flow so that you don’t run into pressure issues; every cubic foot of air that leaves your house needs to bring in cubic foot of air. Running ductwork to the garage can create a serious unbalance for both heating and cooling.

To enjoy the benefits of garage heating, it’s best to get a gas garage heater to take care of heating your garage. Lozier offers two of the best garage heaters through Lennox: The LF24 Garage Heater or the T-Class TUA Separated Combustion Garage Heater. Both are great options to keep your space warm and useful throughout the winter. A heated garage allows you to use the space for many applications. Regardless of the type of heating system you choose, remember that it must be sized correctly to heat efficiently and prevent early system failure.

Garage Heater Sizing

There’s four critical factors and calculations you need to know before getting a garage furnace:

  1. The cubic feet of your garage
  2. The temperature rise you’d like to achieve
  3. The British Thermal Unit (BTU)
  4. The efficiency of your garage

First, calculate the cubic feet of your garage to accurately estimate the best size of heater for your space. Multiply the length and width of your garage floor to obtain the correct square footage. Then, multiply this number by the ceiling height to obtain the cubic feet.

Next you’ll need to know the temperature rise, or the total degrees your garage must be heated to reach your desired room temperature. To calculate temperature rise, subtract the coldest average low winter temperature from optimal heated room temperature. For instance, the coldest average low temperature in Des Moines is about 14°F, according to U.S. climate data. If you want your garage heated to 68 degrees, the temperature rise is 54 degrees.

If you want to take it a step further, you can estimate the BTUs (British Thermal Units) that you’ll need to satisfy your needs. To start, multiply total garage cubic feet by 0.133 then by the temperature rise. Round the result to the nearest thousand. For example, a garage space with 4,000 cubic feet multiplied by 0.133 and again by a 56-degree temperature rise would require 30,000 BTUs.

Factor in the efficiency of your garage when determining heater size. A well insulated garage won't require as large of a furnace as a leaky and poorly insulated garage would. It pays in the long run to insulate and seal air leaks in your garage or workshop. You might also consider installing ceiling fans to help circulate air, especially if your garage or workshop has tall ceilings.

For professional assistance calculating the right garage heater size, please contact Lozier Heating & Cooling. We've been serving the Greater Des Moines area for more than 100 years. Our goal is to help educate our customers in the greater Des Moines, Iowa area about energy and home comfort issues (specific to HVAC systems).