Many furnace and air conditioning problems are actually caused by malfunctioning thermostats. If you think that your thermostat may be the problem, read our tips on the subject here. If needed, Rapid Global Maintenance can come out to troubleshoot your thermostat and provide any necessary repairs or replacements.
One thing to keep in mind is that there are two different types of thermostats: line voltage and low voltage. You should always install the type of thermostat that is designed for your type of furnace.