York Modulating vs. Goodman 2-stage
We recently bought an old house in Toronto that we're renovating, and we're thinking of replacing our 10-15 year old Lennox mid-efficiency furnace with a new high-effiency model. It's a 2000 sq ft. 2-storey brick heritage home with currently uninsulated crawlspace and basement. The house will remain fairly leaky no matter what we do, so the heating costs will be relatively high, hence the thought to upgrade the furnace even though the existing one is working just fine. There's also a $790 government credit available at the moment.
We had an EcoEnergy audit and blower test done that found the following:
Air leakage rate at 50 Pa: 14.84 air changes per hour
Equivalent leakage area: 3671 cm2
Current EnerGuide rating: 35, potentially improvable to 59 if we do all the recommended efficiency upgrades. We're planning on insulating the basement headers and improving the attic insulation, and improving air sealing, but that's it for now (probably about 50% of the recommended building envelope retrofits).
If we were to implement all the recommended building envelope retrofits, the heat loss was estimated to be 70150 BTU/hour (cooling load 34297).
We're choosing between two quotes from reputable installers:
1. Goodman GMVC950905DX 90,000 BTU 2-stage furnace: $3900
2. York YP9C Modulating 80,000 BTU: $4700 or York TM9V 2-stage 80,000 BTU: $4500
We also have a relatively new A/C unit, that seems to be working well, so we don't plan to replace it.
We'd also appreciate advice on what type of air-filter and humidifier to choose.
Also, our current hot water heater is electric (a rental). While we're upgrading the furnace, we're thinking it might be an opportune time to switch to a gas water heater as well. Any thoughts?
Thanks in advance for your guidance!