Salesperson was knowledgeable and polite, and did not pressure us into a decision at all.
We had a new furnace, a/c and central humidifier installed. They were installed on the same day and it took about 8 hours total. Being Lennox products, they have performed very well. Haven't had an issue in the 3+ years since they have been installed.
We liked this company so much we had them back last year to install a tankless water heater, and it was the same experience: installed in about 8 hours (with a new gas line) and the workers were professional and friendly.
Since install they come around every year to do regular maintenance so that the 10 year warranty stays valid. This is a little annoying, but a necessary evil compared to the cost of a big one time repair.
I highly recommend this company. You will certainly find cheaper options out there, but these guys are the best.