It depends on your air conditioning system to keep you comfortable all year round. Regular maintenance helps your system produce and distribute hot or cold air more evenly and consistently. It also reduces the chance that you will come home from work one winter day and find cold air running through the vents. An air conditioning system maintenance package with a priority clause can be worth its weight in gold for some homes.
If you live in a place with extreme weather, running out of heat or air conditioning is dangerous. Even if that's the case, the cost is often significantly less than the cost of repairing broken HVAC equipment or replacing a part. You'll save money in the long run if you realize that your home's air conditioning system needs frequent repairs.