Ones as good as the other.
When I saw this a little while ago I was confused myself. I couldn't find anything in their engineering documentation that mentioned a low fan speed setting. Does any Lennox dealer know if this furnace has a low fan speed setting for constant fan?
Update: I just looked closer into Lennox's engineering data for the G60, and it says "Terminal for continuous low speed blower operation." There's your answer. Looks like these things can be setup for continuous low speed operation. I'm not sure what the "low speed" is, though. This is good for comfort; however, a multi-speed blower cannot vary its speed and isn't as efficient as an ECM variable-speed blower.
Sorry, it's against site rules to discuss specific pricing--even rough ideas. And I'm not familiar with Carrier's pricing anyway. You'll have to ask your Carrier dealer.
Montreal_Canada, let's get you on your own thread, since this thread belongs to the original poster, Nov3ice. You can continue post your concerns and continue your conversation there. Just go to the Residential HVAC forum and hit new thread up at the top-left.
Sorry for cutting into the original thread, Nov3ice; I lost track and forgot this was another thread due to the ongoing conversation!
with rising energy costs the question should not be "how much more will it be to upgrade now?" but rather "how much more will it cost me in utilities over the next 10 years if i go with the less efficient furnace?"