we have been renting a whole house from our LL since 2016; she's in her late 70s and is considering selling to us in the next 2-3 years. The house needs upgrades across the board but one major is the heating system. It's a 1906 brick/stucco house of 5500 square feet. The gas company inspectors have told us it has a "mother of all gas mains" coming in and the system is strange - on the ground floor, four rooms and and main hall have huge forced air registers. air is blown over radiators in the giant ducts in the basement. The kitchen, pantry and half bath have hot water radiators or those horrible electric baseboard looking ones that barely heat. All rooms on the 2nd and 3rd floors have giant hot water radiators in fact, two of the biggest rooms each have a 12 foot stretch of them. Our gas bill (heat/hot water/dryer/cooking) jumps from $200-250 in the summer to $1250-$1400/mo in winter months. Some of the hot water pipes for the system coming out of the boiler are cast iron 6" diameter.
So, what might be some options for upgrading/replacement? What is our system even called? It's split but I never saw forced air with the air being heated by radiators in the ducts (which are HUGE).
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