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Heating the finish room at night

10/28/22       
Pdub Member

As it is getting colder, we are realizing that our new finish room is getting pretty cool at night. We spray mainly CV and that needs a temp of 65-70 to cure properly. Our main shop has forced air and there's a vent in the finish room. The problem is that the thermostat is all the way on the other side, and truthfully I'd prefer not to heat the whole shop at night.

One option would be to put the air makeup unit on a thermostat at night, but that's going to get expensive real quick.

A separate heat system in the finish room seems to make the most sense, but what kind? Overhead radiant works well, but I've heard bad stories about only heating the top side of materials and getting either uneven curing or warpage. Is one of those ceiling mount units where the combustion is contained in tubes and a fan blows over those considered safe? We have a 4" inline fan down by the floor already exhausting fumes through the roof at night.

A final option might be to get those floor standing curing lamps and just set them in front of finish racks/ pieces at night. Again, I worry about uneven heating though.

Any other ideas I'm not thinking about?

10/28/22       #2: Heating the finish room at night ...
RichC

Put in a dual zone control system on your existing furnace. So either the shop or the finishing room can get heat from the same furnace.

10/28/22       #3: Heating the finish room at night ...
duster

We put a 220V heater in our finish room for the same reason. Same type you would use in a garage, with it's own thermostat. It's worked pretty well for our small 10' x 30' finish room.

10/29/22       #4: Heating the finish room at night ...
Leo G Member

I set it at 65º at night which it maintains easily. I keep it at 72º when I'm spraying.
Before I would put two little 1500 watt units in the room and it'd struggle to keep it at 65º. Now it's a piece of cake.

But since you already have your other heat connected I would get a 2nd thermostat in the sprayroom and if you have to you can manually zone the sprayroom if you don't have the capabilities to use 2 zones.

Better than spoiled finishing.
10/31/22       #5: Heating the finish room at night ...
Scott

How is your makeup air set up? The makeup air is 100% efficiency. A unit heater is 80% efficiency. Electric heat is generally a lot more than natural gas.

Not sure how big your space is, but maybe you can add
LO a some fans with a damper to heat the space at night or put a unit heater in the space. A gas fired heater in the space is dangerous if it comes on while you are spraying, it is a non issue if it is turned off while you use the spray area.

If it was me I would get a good HVAC company to come out and assess what is the best option for you.

11/1/22       #6: Heating the finish room at night ...
Bill

You should research relative humidity. If you turn the heat low at night in a woodworking facility you will get large fluctuations in RH. That can really cause problems with your unfinished products on the floor.

We were having issues and eventually just left the heat at 65 24/7. Problems went away and our energy usage to do that was hardly noticeable.

Here is a link to a good thread.

Good Luck
Bill

Humidity in a shop

12/9/22       #7: Heating the finish room at night ...
Bill Colligan Member

How big is the area? I use a mini-split heat pump. Super energy efficient and in the summer it will pull the humidity out. I believe the new ones will work down to about 0 deg. F. Take a look at the Mr. Cool DIY. I used it to replace mine. With zero HVAC skills you can install one in an hour or two.


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