So our 36 X 18 above ground pool is under construction. The electrician just told us to get our electric heat pump we need to upgrade our electric line from 200 to 400 amp. The estimated cost of doing this is $4000 to $5000. If we change to a gas heater, we won't have to upgrade. What do you recommend we do? We wanted electric heat pump to save money on the gas bill. But with this extra cost, will we really be saving a whole lot in the long run? What are heat pump costs electric vs gas per month. We live in Tennessee. Thank you. We need to decide by tomorrow!