My house is 67° F in the winter and somewhere around 72-74° F in the summer. I would die if it were hotter, lol. I have had many successful hatches in my Nurture Right 360s with the ambient room temperatures being in that range.
These are my Nurture Right 360 numbers from last year, my summer hatches were definitely harder as you'll see in my numbers but I feel this was due to the intense heat we experience here in the summer rather than a fault of the incubators because where eggs were collected during cooler periods the hatch rates increased again, but for those that may be curious:
3/1/19: 80% (started with 22, 8 infertile, 3 quitters, 11 live chicks) Version 2 Nurture Right incubator
3/31/19: 100% (started with 22, 4 infertile, No quitters, 18 live chicks) Version 2 Nurture Right incubator
4/23-4/25/19: 82% (started with 44, 11 infertile, 6 quitters, 27 live chicks) Version 2 & 3 Nurture Right incubators
5/14/19: 100% (started with 11, No infertile, No quitters, 11 live chicks) Version 3 Nurture Right incubator (started eggs in Little Giant)
5/16/19: 70% (started with 20, No infertile, 6 quitters (1 was a late loss), 14 live chicks) Version 2 Nurture Right incubator
6/21/19-6/22/19: 64% (started with 33, 11 infertile, 8 quitters (2 were late losses), 14 live chicks) Version 2 & 3 Nurture Right 360 incubators
7/5/19: 100% (started with 4, 2 infertile, 0 quitters, 2 live chicks) Version 3 Nurture Right (finished last few days for lockdown and hatch in Little Giant)
7/16/19: 59% (started with 28, 1 infertile, 11 quitters, 16 live chicks) Version 2 & 3 Nurture Right 360 incubators
8/31/19: 88% SHIPPED EGGS (started with 15, 7 infertile, 1 quitter, 7 live chicks) Version 3 Nurture Right