How cold is it? We can apply spray foam at pretty low temperatures. Hard to believe it is too cold. Might need to turn up your house heat a bit but if it is inside your house it should be good. A trick is to build up a certain thickness to each lift so the heat of the foam reaction feeds the next lift.
The basement is 53* but the Knee wall reads 23*-32* yikes.Do you bring in warm tanks to spray a building? I have never done a house but I did an install job for foam at a factory. We had some mixed results with the foam. The foam company sent a guy out and he had us warm the tanks to 75* and the mix got better. I can warm the basement up with a coal stove we used before the OWB. I do have a kerosene blast heater but never have used it yet, helped a friend moving down south and he had no room or use for it anymore. My only fear would be carbon monoxide but I guess if I used it quickly I should be ok. I'll get quotes on someone doing it and compare to the kits and see how they come in. I do have an infrared thermometer and it seems to be fairly accurate, compared the IR temp reading to a dial thermometer I added to the house boiler and they said the same thing.