There might be hot and cold spots within your home that do not heat or cool properly. This can be due to a number of reasons such as the structure or layout of home, ductwork, air distribution network, insulation, exposure to outside elements, or other variables that are unrelated to your HVAC equipment.
These issues might not be resolved by installing a new HVAC system alone. Resolving these issues will require large and significant modifications to your home and/or air distribution network.
This quote does not include any of the work outlined above.