Increase the return air. More air back = more out. Make sure you have a less dense filter to allow more air to pass through AC coil.

Try damping down first floor registers so air is directed upstairs.

Not normally - there are specialized tools that are needed.

Mostly cleaning and changing filters. Also, the charge should be checked.

Yes, by buying higher energy rated equipment such as Wi-Fi thermostats, hybrid electric heat pumps and water heaters.

It may be low on charge or have a clogged filter.

Accessories like UV light and HEPA filters.

Yes! Coils become filled with dust, dirt, and animal hair. Air Conditioning coils should be done on every 10-20 years.

Openings in the ductwork may need to be sealed. This will help in the heating season too.

Yes!