Your filter must be free from dust and clogs to perform effectively. Replacing your filters regularly will ensure your HVAC unit will operate at its maximum potential.
Check the surrounding of your outdoor unit. Make sure it is clear from debris, now, and ice in the top, sides, bottom and around it.
Outdoor units collect dirt debris. Coils must be cleaned routinely during winter HVAC maintenance. Dirty coils are like clogged filters, they can hamper the performance of your unit. Use a water hose and a cleaning agent to clean the coils. Wash it from the inside out.
Indoor blower drives the air out of the system. When the blower is dirty, air may not come out right even though the system seems functioning. Regularly inspect your blowers for dust buildup.
Duct systems come in different types. Make sure you are using the right size, otherwise, your HVAC may be breathing through a small hole. Common duct systems are below: