A carbon filter is the main odor control solution. I am hoping to avoid the expense of a new in-line unit.
I looked up HRV (Heat Recovery Ventilator) and you are on the right track. An HRV places fresh air alongside used air separated by a highly thermoconductive (High U-value) surface. The goal being to transfer most of the heat between the air flows before replacing the air.
My goal is to do half of that; transfer heat through a highly thermoconductive surface without exchanging the air. Common materials that are highly thermoconductive are: aluminium, brass, copper, diamond, gold, nickel, platinum, silver, and various steels. The best conductor in that list, by far, is diamond, but a thin sheet of any of those materials will be good ( and diamond would also allow light leaks Copper sheeting is the second best choice, but any of them are good as long as there is airflow along both sides of the sheet.
We will have regular airflow along both sides of the wall seperating flower from veg (air circulation fans) so the only thing I have to do to transfer a bunch of heat is to create a "window" of thin, opaque sheet metal between the veg and flower areas.
Thaks for the inspiration!
Sounds awesome Rad! Look forward to hearing how this goes. Before reading this I was going to suggest a propane space heater but I guess propane can be expensive too. That is what I have but my tents are in my main living space for now which presents the problem of it being too hot for us and occasionally dipping too low for the plants because of that. Wish I could use some solar heat.
Happy Holidays Rad!