Ummm, I highly doubt that an A/C thermostat will go up to 99*. If it does, PLEASE let us know what kind it is!For now, yes. However we found a really good air conditioning thermostat in our garage that we want to trade out with our current one, and then put the old thermostat in the incubator. Do you think that will work? We have been lucky to keep the temp right for this long, it is a lot tetchier than I thought it would be.