I just had a contrator over to give an estimate for installing a humidifier in my home (suburbs of Denver and very dry). I've done some research including reading many forum posts here.
House: Built 2003, 2400 sq ft, gas furnace with central air, unfinished basement ~700 sq ft.
The contractor gave me a quote for an Aprilaire 700. I mentioned that I've read the 600 would be sufficient but he dismissed that outright. I also asked if the 700 would have an outdoor thermometer. He said no because it would also need a controller board and IAQ thermostat.
Based on what I've read, that doesn't sound right but I'm not an HVAC person (I was an electrician in a previous life). I'd like to hear what you all think and yes I'll be getting a second estimate.