I have a 25' x 30' garage with 14' ceilings. No insulation except for the roof which is TPU over 4-8" of foam (8" close to house about 4" as you get away for drainage, probably averages out to R30 insulation). My garage door is really leaky. The last week with the temps as low as 22 overnight, the temperature in the garage never got below 47. I was doing paint and body work and I also don't like being cold, so I wanted to get it into the high 50s or low 60s.
Last week I added this heater since I already had 220 in the garage for my table saw and band saw: https://www.amazon.com/dp/B009NJ6K8K?tag=wranglerorg-20
It worked well, raising the temp about 4 degrees per hour according to a temperature/humidity gauge I can monitor remotely and graph. To me it felt warmer than that.
I did some paint and body work all last week and the paint had no issues with the temperature range the heater provided. It was a very dry heat too since it was electric with the humidity staying in the 30s even when I was etching, wet sanding, and cleaning/degreasing. I'm sure it was expensive to run, using 5600W, but I only ran it 2-4 hours a day. It worked well even when I had the garage door raised about 30" with a fan blowing out to clear the paint fumes.
Over the weekend I added this smart 220v pool switch https://www.amazon.com/dp/B0CZP682FR?tag=wranglerorg-20 so I could have the heater start running about an hour before I go in the garage each morning (I usually spend 430am -6am in the garage before getting ready for work). I used this extension cord https://www.amazon.com/dp/B0DHZVQ7D2?tag=wranglerorg-20 as the leads for each end into the smart switch. I have about 5' going from the switch to the receptacle and the other 20' so I can place the heater wherever I want to in the garage. I think the wire in the extension is undersized a bit for a 30A 25' extension as it is thinner than the 30A extension I have for my RV. It's 12AWG stranded... I think it is a little under 12AWG in reality and the RV extension is 10AWG. The line running from the main panel to the garage sub panel is 8 or 6 AWG. Anyway, the combination seems to work well and while the extension is warmer than room temperature by a good 10 degrees, it is not hot anywhere that would cause concern.
I think I spent a total of $250 on everything.
Last week I added this heater since I already had 220 in the garage for my table saw and band saw: https://www.amazon.com/dp/B009NJ6K8K?tag=wranglerorg-20
It worked well, raising the temp about 4 degrees per hour according to a temperature/humidity gauge I can monitor remotely and graph. To me it felt warmer than that.
I did some paint and body work all last week and the paint had no issues with the temperature range the heater provided. It was a very dry heat too since it was electric with the humidity staying in the 30s even when I was etching, wet sanding, and cleaning/degreasing. I'm sure it was expensive to run, using 5600W, but I only ran it 2-4 hours a day. It worked well even when I had the garage door raised about 30" with a fan blowing out to clear the paint fumes.
Over the weekend I added this smart 220v pool switch https://www.amazon.com/dp/B0CZP682FR?tag=wranglerorg-20 so I could have the heater start running about an hour before I go in the garage each morning (I usually spend 430am -6am in the garage before getting ready for work). I used this extension cord https://www.amazon.com/dp/B0DHZVQ7D2?tag=wranglerorg-20 as the leads for each end into the smart switch. I have about 5' going from the switch to the receptacle and the other 20' so I can place the heater wherever I want to in the garage. I think the wire in the extension is undersized a bit for a 30A 25' extension as it is thinner than the 30A extension I have for my RV. It's 12AWG stranded... I think it is a little under 12AWG in reality and the RV extension is 10AWG. The line running from the main panel to the garage sub panel is 8 or 6 AWG. Anyway, the combination seems to work well and while the extension is warmer than room temperature by a good 10 degrees, it is not hot anywhere that would cause concern.
I think I spent a total of $250 on everything.
