My electric bill was probably more then $100 a month cheaper before I installed the own, but the house was never set above 65 and that was only in the zone I was in when I was home. I had a oil burner with forced hot air on the first floor and baseboard heat on the second. Last year was my first year with a own my unit is 130-150 ft from my indoor boiler I only have the one pump outside the lines go into my depressurized boiler, each zone uses the pump it already had, last year my house was perfect I set all the thermostats to 65-68 all the time so the forced hot air was on more that means the humidifier goes on more too. I am sure every house varies but I was a cheap mofo Shen it came to heat before I had it so I expected the elec to go up