I have a Bryant gas furnace that is 12 years old. I've replaced the filter, thermostat (last year) and the HSI about 2 or 3 years ago. The HSI doesn't have a crack and did recently file it once our problem first started. Our problem has been going on for about 3 years now when it gets cold outside. The furnace will run and keep the house set at 70 degrees throughout the day. Come night time it then will shut-off and won't come back on. We usually wake-up to a house in the mid 60's and turn the circuit break off/on and that kicks back on the furnace. My initial searches online are leading me to think it's the control board. I've found a replacement online and after inspecting the current board it doesn't look that difficult to replace. I just am hesitant to spend $375 if that isn't the problem. I also don't want to spend extra money on labor for someone else to diagnois and fix...

Suggestions or any help would be much appreciated by myself, wife and 3 kids under the age of 3...