posted 13 years ago
Where are you? How cold for how long do we have to deal with. How often do you refill the tank with "warm" water? Are you willing to run a light or small heater? (I am assuming you have power since you are talking about a jet pump).
1. Earth floor is GOOD. You want to dig around the base (like a foundation stem wall) and place insulation in there (helps tie the space into deep earth temp).
2. Any construction will work, use as much insulation as you can afford/find. 8x8 won't take much even if you buy new.
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