Why am I using more gas overnight than during the daytime?
Normal gas bill up to November was about $30-$40/month. After that my monthly bill has increased quite a bit - you can see my gas usage has increased over 10x. I was for sure expecting a larger increase over the winter but want to make sure this big of a jump is reasonable. I have an Ecobee but my online account doesn't show me runtime data (it says not enough data?), so I've taken to manually reading my gas meter to get an idea of how much I use daily. I check it twice a day, 9am and 9pm. I notice that between 9am-9pm, I use about ~5m3 but between 9pm-9am, I use ~8m3. This varies by day but the overnight use is always higher...this doesn't make sense to me? Why would I use more gas overnight than during the day? My thermostat is set at 21.5 during the day and 19 at night. Stove is electric and no one is using the dryer or taking a shower at night so I can't think of other appliances using gas. Help please?