There are 2 inches of closed-cell spray foam insulation in the ceiling and walls. (You can watch it being professionally applied here.) A centrally-located diesel heater keeps you warm in all but the coldest weather. (Or use a little electric space heater if you’re plugged into shore power.) The combustion chamber of these diesel heaters are separate from the passenger air, so no fumes or moisture enter the passenger compartment. (Watch it being installed here.) Even so, if you don’t take precautions, excess condensation from cooking (or just breathing) in cold weather can create a risk of mould and mildew forming on surfaces. Every square inch of wood in this build that does not have a clear urethane finish, has a coat of mould and mildew-resistant primer on it. This includes both sides of the plywood flooring and the underside of the tongue-and-groove pine ceiling. The central area of the bed in the rear is made of slats to allow for air circulation under the mattress. I custom-built about ten clear vinyl storm windows to reduce drafts. For summer comfort I have installed two top-of-the-line Maxxair ceiling fans. They are speed-adjustable and reversible. And here’s their best feature: they have an overhead cowling so they can run in the rain. You can continue to have fresh air in a summer storm. (Watch me install them here.) Camping in Ontario in the summer, you won’t want the windows open after sundown, with lights blazing inside. You’ll be a magnet for bugs. So I have custom-built more than ten window screens that let you open windows for air circulation without bugs coming inside. (Watch me make them here.) Air circulation will only get you so far in a heat wave. This summer I added a 10,000 BTU window air conditioner. (Check it out here.) It stores neatly away under the kitchen sink when not needed. To use it, just swing open the emergency window by the dinette and slide it into place. (As with almost every van or skoolie, you’ll need shore power or a generator to run AC for very long.) There are enough cotton fabric curtains for one side of the skoolie, and Reflectix window covers for the other. To better manage the heat, place the Reflectix window covers on the side getting the most sun..

Click on a picture to see it larger