Originally posted by Ben @ JNS Imports
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The 4800-5000w construction heaters are well worth the money, they have an internal fan if you didn't notice, My garage stays a cozy 15°C and the heater kicks on maybe once every 30 min for 5 minutes. A well insulated garage doesn't need much heat to keep it warm.
as for your gaps, if the door isn't going to move for while then sticking in insulation will work and be easy. you just want to stop the cold air for blowing in, if you look at good installations the tolerance is tight but they still use a wide rubber flap of sorts to keep the airflow from happening.


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