[kintrust]

Hi, could someone please tell me what should do? Thanks!

Gas Furnace name: Lennox, More than three years

Since yesterday, it is almost not working. I checked it took long time (maybe two hours)to start fire and after half minute the fire dead and other half minute hot( not hot as normal) air will be down.
The temp set at 22C but only 18C now. I called someone, however I was told it is too busy on weekend.
Question:
1) what should I do?
2) any recommendation for which company or person I should call to fix it?
3) should I join a service plan? How much is the normal price?

Thank You Very Much!
You have a great weekend!