Hello,
I own a 1550sq ft home in Northern AZ (7000ft, similar climate to CO) that was built in 1989. Furnace is original to the house. I want to replace the furnace because it's loud, inefficient and well beyond predicted lifespan (31 years!). My furnace + water heater are in a "closet" with closet doors both into the house and in the garage. There's also a rather large ~1'x1' vent to outside on the 3rd side of the closet. Got a couple of quotes, all contractors remarked that my current set-up doesn't meet code. The contractor I liked the most installs Armstrong furnaces.
Trying to decide between 80% two stage & 95% single stage furnace. Even though we keep the house cool (60F at night, 64-66F during day), we use heat 5-6 months a year because nights are chilly and I would like something more energy efficient but am having trouble weighing the two options. The 95% is a more complex install (more things to go wrong?) and therefore a little more expensive but seems to be the "safer" option with regards to CO poisoning. As a layman, I'm getting confused and hoping for some expert input where there's no vested interest in getting me to purchase the more expensive option!
Do you prefer 80% two stage or 95% single stage? Ever heard of a high efficiency furnace freezing in the garage? Some friends have had problems with their attic-based high efficiency furnaces freezing over during cold snaps and definitely don't want that!
I own a 1550sq ft home in Northern AZ (7000ft, similar climate to CO) that was built in 1989. Furnace is original to the house. I want to replace the furnace because it's loud, inefficient and well beyond predicted lifespan (31 years!). My furnace + water heater are in a "closet" with closet doors both into the house and in the garage. There's also a rather large ~1'x1' vent to outside on the 3rd side of the closet. Got a couple of quotes, all contractors remarked that my current set-up doesn't meet code. The contractor I liked the most installs Armstrong furnaces.
Trying to decide between 80% two stage & 95% single stage furnace. Even though we keep the house cool (60F at night, 64-66F during day), we use heat 5-6 months a year because nights are chilly and I would like something more energy efficient but am having trouble weighing the two options. The 95% is a more complex install (more things to go wrong?) and therefore a little more expensive but seems to be the "safer" option with regards to CO poisoning. As a layman, I'm getting confused and hoping for some expert input where there's no vested interest in getting me to purchase the more expensive option!
Do you prefer 80% two stage or 95% single stage? Ever heard of a high efficiency furnace freezing in the garage? Some friends have had problems with their attic-based high efficiency furnaces freezing over during cold snaps and definitely don't want that!
source https://hvac-talk.com/vbb/showthread.php?2223620-New-furnace-80-2-Stage-vs-95-Single-Stage&goto=newpost
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