Lower Heating Bill!

We insulated the attic at the beginning of the Winter. This Winter has been so, so much colder than the previous years we have lived here (as in like 10-15 degrees colder), that we didn't see more than a tiny reduction on our heating bill. Well, yesterday I got a bill in which the average temp this year was only 4 degrees colder than last year, and the bill was cut in HALF! Obviously I don't expect it to be that great of a difference every month, but it was just good to see our hard work pay off finally!