Thats what I thought I had them set on 43. I am not sending mine to Calif. anymore so would like to get them to live in Minn. I built boxes out of 2x12s. And made bottom boards 6 in. deep so to be able to build a trough in the middle 4in. deep and 5in. wide with screen on top of it to keep bees away from it for heater. I use a heating element out of a bunn coffee maker. They are 60 watt. Then I made a inner cover that is to thick when they are building comb. And a top cover that has 3 in of styfoam insulation in it. About as costly as our house we built. Ha. But at the price of bees now days better keep them alive. Hope I havent bored any body to death yet by inventing the wheel again. Harold