Cham eggs don't need a constant temperature. Just keep your veiled eggs between 65 and 84 until your incubator shows up. If it is too hot in your home, try a hard tiled floor or wood or linoleum like kitchen or bathroom - those are always several degrees cooler at least than the temp at thermostat level in your home. If your home is too cool, try closing a small bathroom to trap heat, try higher up near a ceiling.Try different rooms closer to whatever heat source your home has.