Inside house temparature during cold weather

It depends on where your water lines run into the house and how well insulated your house is in general. Test different temperature settings by setting up a cheap thermometer in various parts of the house to see how much colder it gets in those spots. Obviously you'll want it to be above freezing (32 degrees) . It is a matter of finding the temperature setting on the thermostat that maintains a steady +32 degrees. You'll have to find that setting based on your house's level of insulation and how much you're willing to spend. If the house is vacant, a setting of about 45 to 50 degrees should do it. If the house is occupied, you'll probably want it between 55 and 60 to still make it livable.

Thanks for reply - I have written this because one of the wash basin pipe start leaking from joint. The house is occupied and we are living in it. Normally I keep temp 58F but then I went down to 54F for 3 -4 days and I saw this thing happened. So I am curious to know.

Do you think that the pipe froze, water expanded, then started flowing?

I think it's just a leak. I doubt if it's due to cold weather. The pipe would burst, not leak.

My plumber said my crawl space could go no lower than 45 degrees. You are far above that.

I feel safe leaving it at 50 degrees inside. But, the person who owns my rental apartment prefers I set it at 55 degrees.

I keep my house at 70+ 24/7, often it's too hot but it varies by room. I get almost no physical activity so I usually feel colder than the temp would indicate. Lady Diane would feel too hot if it was 32.

Do you have a programmable thermostat, or have you considered one? Assuming your home has a decent envelope and isn't too drafty, you should be fine leaving your house at a fairly low temperature when it is unoccupied. With a programmable thermostat, you can have the furnace turn off during the day, and then start up again a few hours before you get home. You certainly don't need to run your heat all day long. I would contact an HVAC specialist about programmable thermostat options and other ways to reduce your heating bill.