Many calculators (example) can obtain heating load or the whole house or of a single room with room based on area, room height and other factors (windows, insulation etc).
My 1927 home has existing ductwork which I'd like to confirm whether the existing ducts/vents are properly sized. If not, I’d like to do adjustments (e.g., replace a 6” with an 8” duct).
However, this is not as straight forward:
- There is a single common return in the hallway which implies that all doors should be open anyway for proper airflow
- The house has two floors with heating only in the lower floor
- Lower floor features 2 bedrooms but otherwise is open floor plan with hallway, dining room, living room, kitchen connected (no doors)
- All rooms have standard ceiling heights of 8", except the living room which has a heigh ceiling (12") ... noteworthy they are connected via large opening.
- Next to the dining room are the stairs the the second floor (unheated). The rooms in the second floor can be closed but the upstairs corridor is still connected to the rest.
Room sizes first floor:
- Bedroom 1: 149sqft
- Bedroom 2: 176sqft
- Bathroom: 58sqft
- Hallway: 50sqft
- Diningroom: 184sqft
- Kitchen: 105sqft
- Nook (next to kitchen): 71sqft
- LivingRoom: 217sqft
- 1927 home in Bay Area, California
- gas furnace was recently replaced with 3-ton heat pump using existing duct work and vents.
- No cooling required, only heating in winter
First floor layout:
How do I go about calculating the heat load in such a layout/setup?
Do I calculate the heat load of each room?
How do I account for the fact that the rooms are connected with either no doors at all or doors that need to be open (Bedroom1/2+Bathroom) due to common return?