HVAC ducting - Climate Zone 7a
The house is 40 year old bungalow with heated basement. It has an older 80% efficiency forced air natural gas furnace with an input BTU/hr 88,000 and output BTU/hr 71,000 with 1400 CFM.
The living room is 268 sqft and is ~24% of the total volume of the main floor, which is open plan so it is connected to the dining room (268 srft) and kitchen (137 sqft), each being ~12% of tot vol, respectively. The living room is at grade level with 9.3' high ceilings, compared to the rest of the main floor that has 8' height ceilings and is ~2' above grade.
It currently has 1 heat register under a new energy-efficient 78"x80" patio door from a long 5" heating duct that is ~24 feet long from the main supply duct. It has another two other heat registers under the 96"x58" living room window, each supplied by their own 6" ducts that are ~32' long from the main supply duct. The airflow pressure to these registers doesn't feel as forceful as the others in the house. It also has an air return in the room.
The rest of the main floor has a master bedroom + ensuite, 2 bedrooms, and 1 bathroom. This is a 1400 sqft bungalow but I measured ~1120 sqft in terms of 'living space'. Each room has a heat register, and there is also one by the front door and another by the back door. These are all 5" ducts.
I still have to complete the insulation of the basement, the living room is at grade level, it is the furthest room from the furnace, has the longest ducting, and it has 82 sqft of windows so there are a few reasons why this is the coldest room in the house.
I have adjusted the dampers throughout the house but just wanted to know if anyone had any thoughts and/or recommendations on the heating of the living room and maybe how the ducting could be changed/ improved?
Thanks in advance.
Posted Mar 19, 2017 10:08 PM ET
Edited Mar 20, 2017 12:50 PM ET
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