Add supplemental heat to conditioned crawlspace
I built a 300 sq ft addition this summer on top of a fairly shallow (24″) ICF crawlspace. This is in the middle of Canada, and now that winter has set in im starting to see how the heating system functions.
I extended two separate branches from my forced air furnace into the addition, and opened up a small hole at the far end of each branch according to the instructions for air flow and air changes. There is an open passage way from the crawlspace into the existing basement for return air.
The addition itself stays close to the the temperature of my main house, perhaps a degree or two cooler (19 C), but the crawlspace is approximately 5-6 degrees Celcius cooler than the house (15 C). This obviously creates a cool, unpleasant floor and results in the addition feeling even cooler than it is.
I need to raise the temperature in the crawlspace without sucking much more air from the addition itself. My first test will be to add a few more holes into the ducts within the crawlspace, but i dont want to do so much that the addition gets colder.
If I choose to add a supplemental electric heater into the crawlspace, what type is my best option?
I was thinking that a simple baseboard heater, suspended close to the crawlspace floor might be my best bet? Im a little concerned though about whether or not two feet of head room above a baseboard is enough.
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