How do I Build a Greenhouse Window With Temperature Control?

Install a jalousie window. If necessary, remove the old window, and scrape off the old caulk with a putty knife. Use a hammer to remove the nails from around the frame. Lift the windowpanes out. Douse a cloth with bleach and water and clean the frame.

Lay shims on the bottom of the frame. Fit the jalousie window into the frame and nail the top of it into top of the frame. Caulk around the window. Nail the rest of the window into place. Fill any gaps or holes with wood putty.

Install an exhaust fan. On the opposite side of the greenhouse from the jalousie window, remove another window and clean the frame as described in Step 1. Place shims into the bottom of the frame. Fit the fan into the frame so that air flows into the greenhouse. Caulk the frame. Seal the frame with flashing tape.

Install an automated ventilation kit. Measure the distance necessary for the kit's rods to push the slots of the jalousie window open when fully extended. Place the kit's motor that distance away from the jalousie window. Shade the temperature-sensor box attached to the motor just slightly with either plants or a shade cloth in order to get an accurate temperature reading.