I have a water furnace ndv049 4 ton loop field how many kWh should this thing be using in june when It did not need to run my total was 303, this December the avg temp was 21 and my usage was 1744 and it iS not even that cold. I had the out to evaluate it and they claim it is working fine. It seem to draw a lot of power when it comes on and is not all that quite. It does have the dwh. Any insight you can give would be great.