Make sure your refrigerator door seals are airtight. Test them by closing the door over a piece of paper or a dollar bill so it is half in and half out of the refrigerator. If you can pull the paper or bill out easily, the latch may need adjustment or the seal may need replacing.
Earnest money is money put down to demonstrate your seriousness about buying a home. It must be substantial enough to demonstrate good faith and is usually between 1-5% of the purchase price (though the amount can vary with local customs and conditions). If your offer is accepted, the earnest money becomes part of your down payment or closing costs. If the offer is rejected, your money is returned to you. If you back out of a deal, you must forfeit the entire amount.