Well, the HVAC should be operable before the finish trades are working. There’s a lot of moisture that has to be pulled out of new construction before anything wood goes in.

But theres not nearly enough information in your post to do more than guess!

What's the normal bill amount?

Trade ya!

Yes. HVAC in. No LP tank to supply yet.
Next question, who pays for electric ?? Me or my contractor.

depends on contract, but yes interior should be warm & dry from drywall tape to compl.

Some use temporary electric heaters. 220v can pull alot. This is not a surprising bill.

It's less than a usual monthly bill in FL.

If your mud finish crew has to come the next day, you have to run those heaters. Next the flooring /cabinets has to be acclimated. So running dry and later AC could hit $225..

k. thanx. but i pay it. or contractor. ??

just sticker shock. Sorry All

Depends on the wording in the contract.

Make sure you are keeping all the drywall dust out of your system.

Its in your contract but one way or the other you are paying it. Whether directly or to your Contractor. But you are responsible for it.