DAYUMMMMMMMMM EV....DATSA NICE GEEEEE-ROGGGGGGG !
ok... now we are getting into my area of experticse. ! i have been a carpenter all of my life...so take it from there.
obviously the greater the "R" value, the warmer it will be and less energy to keep it warm...and less energy to GET it warm. the best thing out there that i have seen and used yet is RADIANT FLOOR HEATING. this,,,for those that dont know...is plastic "pecs" TUBING RUNNING IN THE CONCRETE FLOOR. there is anti freeze in there to create heat from a boiler. but all of this is WORTHLESS if the walls and floors arent insulated well. INSULATION IS USELESS WITHOUT A HEAT SOURCE. if you have a block building, fur out the walls with 2x6's and use R-19 with a vapor barrier. a vapor barrier is just plastic visqueen. r-38 is good for the ceiling.if you plan on keeping the garage heated all the time...5/8 drywall is usually code for garages. mud and paint. if you let the garage get cold and then heat it up again , all your mudwork WILL crack,,,,( seen it a million times.) you can put wood trim over the drywall seams and not have to worry about cracked drywall....i suggest this method. caulk the wood to the drywall and paint...NO MORE WORRIES. remember,,,heat rises... and ceiling fans blowing downward will help tremendously. if you are building a new garage...DO IT RIGHT THE 1ST TIME....or youll have nothing but issues later. i have made a living of fixing peoples screw ups and rush jobs....because it will cost 3 times as much if you dont do it right, and have to fix it later !!!!
*THIS HAS BEEN A MOPAR PUBLIC ANNOUNCEMENT...and thank you for your support !