The cos to fill up a propane tank for a house depends on the size of the propane tank and the current propane prices in your location.
Propane tank sizes can vary depending on the size of the house and how much propane you need to use to heat your house or use for cooking, hot water etc.
The cost also depends on how much propane you need to fill the tank and the current prices of propane which can change from month to month and sometimes even day to day.
Assuming you pay $2.00 per gallon for propane and your propane tank for your house is 500 gallons then to fill the propane tank would cost you $1,000.00
That propane tank of 500 gallons should last you between 1 to 2 months depending on the size of your house and how much propane you use.
I had a propane tank of 500 gallons that lasted me 2 and 1/2 months in the winter and lasted the whole year and a bit longer when in the summer months.