Winterwind, you might be surprised at how much cooler a tank with a screen lid and no strip light can be than a tank with a traditional aquarium hood. My 20 gallon with a full Eclipse hood and 30w of lightings stays steady at 74 degrees. My 29 gallon newt tank with screen lid and wall mounted compact flourescent stays at 68 degrees. They are in adjacent rooms with the same central air conditioning and both are beside windows. I think having a canister filter helps alot too. I sprung for the zoo med turtle filter, and it doesn't raise the temp at all.