I'm needing help in building my self a new incubator. I'm wanting to turn a fridge in to an incubator. And I'm needing to know what the watts of heater to square feet/inches . Any help in this would be great. I'm planing on it being forced air for sure. I'm thinking I'll use 4 to 6 pcu fans at least. But I really need to know how many watts of heat I'll need.