I posted a question to another thread a week or so ago, and the answers I received sparked the need for another question/remark.
I moved into an 18 year old house a year and a half ago, and within the next year or so I will need to buy a new furnace and AC. Every once and a while I take some time to do some research, and this forum has been a gift!
The only thing that I have decided on conclusively is that Iíll go with an 80% furnace. I live in Toronto, and the winters arenít that bad (although last winter was relentlessly cold!), my house is only 1200 sq ft, I keep the heat in the daytime at <70 as Iím busy all the time, and that warms me up, and like the house cold at night, so the t-stat goes down to 60. Based on that, I donít believe there would be any payback on a 90%. Please correct me if Iím wrong!
Here is where Iím getting bogged down. Single stage, two stage or variable? While I recognize the benefits of the variable, Iíve pretty much counted that out. It should all come down to comfort, right? Last winter, while it was bitingly cold for long periods, I was quite comfortable with my 18 year old single stage. It does have a 2 speed blower on it though, circulating all the time on low, and I wonít give that up. As far as the 2 stage goes, it seems there are issues with your duct work. If you donít have a well designed system, (and after trolling this site, it seems that most of us donít!!) while operating in the first stage most of the time, you may not get enough heat pushed to your upper level. Right? Well, my office is upstairs. Not an option. Iíve had a contractor here trying to sell me a two stage. Did he look at my duct work? NO! In fact, due to the answers to some of my questions, he wonít be back. According to him, it is NEVER necessary to balance ducts, and when I asked about doing a load calc, he told he that that wasnít necessary either! Dave in NJ, kudos to you for being so honest with your client Linda. I hope she recognizes what a gift honesty is. Iím often wondering if contractors in general (there have been a few since becoming a HO) think everyone is uninformed or if Iím clueless because Iím a woman!
SoÖif my ducts arenít that good, I should stick with the single stage, right? What if my ducts are well made? Iíve been comfortable with the single stage, and the advantages of the 2 stage are mostly comfort. Would there be any other advantages of going with a 2 stage?
Oh, one last thing. From what I can tell, it looks like the single stage (Iím looking at Carrier, but it will be whatever that good contractor I eventually find installs!) have at least a 3 speed blower, that you can run all the time. Is that right?