Brrrrr... Cold spell proved to me just how bad the heat is in my Land Rover. So I want to install additional heater in there. The stock heater is crappy, the truck is drafty and has a big interior. When it gets down into the single digits, it barely even gets the temp above freezing in the interior.
The question is, how many BTU's do I really need? I see these things going up to 24,000BTU's and higher.
Uh, how much should I get?