Depending on the heat load of your house which depends on a number of factors including total wall square footage and how well its insulated and air sealed, you might get plenty of heat out of the unit when it is above freezing. Hard to tell, I know my heat load numbers from actual furnace runtimes to know that 10000 BTUhr of heat is about what I need to keep my 2100 sq ft house up to normal room temperature with a 30 degree outdoor temperature but I've got an unusual tall house design and I've improved my air sealing a bunch, still working on it though.
Regarding warranties, usually any system purchased online from most manufacturers will void the warranty, same goes for if you install it yourself. I personally think that the savings of buying it online and installing it myself are worth the loss of warranty coverage. Then again I don't have collision insurance on my car so I think certain risks are worth their reduced cost.
Last edited by MN Renovator; 09-23-13 at 02:10 PM..
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