Hi. Just had a new geothermal system installed in my one-floor, 3 bedroom home built in the 60s. I have a fairly generic question: Is it more efficient to leave the thermostat on one temperature 24/7 (say, 69 degrees), or use Wake/Leave/Return/Sleep programming to drop the temperature when I'm away at work and sleeping? For 'Leave' and 'Sleep' I'd set it to 63ish. I live in New England where winters hit 0 degrees on occasion. I would think it's easier for the system to maintain a set temperature than to work hard bringing the house back up from 63 to 69. Am I wrong? Thanks in advance for any insights.