I moved into a house built in 1978, and I have been working to improve the efficiency since I purchased it. This winter though I was in for a real shock when I saw a $350 power bill. For one person. My previous, much newer house my average bill was around $90 with natural gas costs of around $30 This house is all electric, (now with solar panels!) so I was determined to find out where all that electricity was going. Before Sense I really didn’t know if the house wasn’t insulated right, or was my Heat Pump equipment faulty. Given the equipment age I kind of had my suspicions, but when you are talking about HVAC gear or replacing windows, it’s a huge investment to make the wrong call, and I needed to know if I should replace the HVAC unit, or dump that money into new windows. The $400 Sense device, coupled with an inexpensive infrared camera helped definitively solve that mystery. It turns out my 41 year old heater core and 20 year old heat pump were eating away at power like a competitive pie eater during a pie shortage. The windows were actually relatively intact, though I do need a pair of more efficient doors at some point. Prior to installing the Sense I was actually leaning towards doing the windows, which wouldn’t have fixed the issue and would have probably meant it would be a few years of $300 bills before I could fix it. With my new state of the art system I have already seen a roughly $200 per month reduction during the coldest winter months.