Professional woodworkers buy quality tools capable of precision adjustments. Two tools which give them a leg up are the thinckness planer and planer/joiner. If you don't have these tools to help make sure your stock is perfectly dimensioned, try to find someone who has them and will dress up your project lumber for you. Chances are good that the wood you buy from the lumberyard will not be precisely square and true, and will need further processing if you are building a project to critical dimensions.
Position your refrigerator away from sunny windows, hot water heaters, warm air from heating ducts, radiators, stoves and other heat sources. The heat makes cooling harder for your refrigerator.