Dont have to heat garage at all.
All the 4x4's have the Hydor in line heater with the knock off eheim filter.
The 2x4's have the 2 sponges i sub.heater with guard and a Hydor in tank heater/pump combination{not sure what they were called}
The ponds are getting 2 Hydor inline heaters and 2 knock off Ehiem filters.