Temperature

Batt insulation is best between wall studs and ceiling joists. Spray foam works best in attics rather than garages, so will be a good choice if you have a storage loft. Use rigid foam on the garage doors.
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Radiant heat feels the warmest because it warms the person rather than the air. Forced air feels good but wastes energy on heating air that quickly gets cold again. Convection heat feels good so long as it's close to your body. Electric heat is expensive to run but requires no
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Batt insulation is superior to rigid foam board on several metrics. Although it appears to cost more than foam board insulation, it has a higher R-value. Dollar for dollar, you get more insulation from batt insulation than from foam board.
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Dehumidifiers do work in garages, but some work much better than others do. Refrigerant-condenser dehumidifiers are effective above 60 deg. F. Desiccant de-humidifiers can remove moisture when the temp is about 40 deg. F. Even a small dehumidifier can bring moisture down to safe and comfortable levels.
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The best budget thermal leak detector is the Black & Decker TLD100. The best James Bond coolness thermal detector is the FLIR One. There's one for Android and one for Apple phones.
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Here are three garage door seals that will keep out wind, rain and snow. There's one each for replacing the rubber, replacing the rubber as well as the channel, and for placing a seal on the floor rather than on the door.
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Insulate, air condition and heat my garage.
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The best metal door and wood door garage insulation.
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You can convert your entire garage into a garden, or allocate part of the garage using a grow tent or vertical aquaponics.
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Clear out the garage floor. Light the garage. Clean the garage. Control the garage temperature. Beautify the garage floor.
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