We recommend that regular maintenance and repairs are done to your air conditioner and heating units. This is essential in extending your unit's life, and will also save you money on the long run.
If your central heater is heating your house unevenly, it may be a problem where the insulation starts wearing out around parts of the ductwork. When this happens, replacement of the insulation layer is required.
There is a small device hidden inside thermostats called a heat anticipator. If your heater seems to be behaving weird, it may be because the anticipator stopped functioning correctly, requiring a replacement.