I have 1 fancy goldfish in a 10 gallon tank. He is in my sun room. We are headed into a gold old cold Canadian winter & I'd like shut the door between the sun room & the rest of the house & use it as an airlock to make the rest of the house easier to heat. It will be no problem moving the few plants or my lap top, but the goldfish................ I have 1 lead off my heat pump in the sunroom, but I don't know how much good that will do. What are your feelings ?