My house doesn't have central a/c and heat but I live in south east Texas so we do ok with ceramic heaters in each room. I have my incubator located in my bedroom on a tall table with the ceramic heater right in front of it on the floor. As long as the heater stays on even if it's just a little bit the incubator stays at 99.5-100 degrees. Which works perfectly since this is my second hatch. First set of Serama eggs though I am a newbie on those. Lol. I can't wait to cuddle those tiny cuties.