How often should I change my filters? Well this really depends on conditions of the home. It ranges from 30 days to 3 months depending on pets, high traffic, and environmental conditions. What is a SEER rating? It stands for Seasonal Energy Efficient Ratio. Basically, the higher the Seer rating the more efficient your unit is, enabling your equipment to use less power which saves you money all around. How much is a service call? Monday through Friday 8:00 am - 5:00 pm it is free when you have any service performed. What do you warranty and for how long? With equipment change outs, we offer 2 year labor through Southern Comfort and factory warrants all equipment. Also available are extended warranties.