[BaldLoonie]

Then there's the issue of refrigeration. A heat pump needs less gas in the heat mode when the smaller indoor coil becomes the condenser. So if you hack a 4 ton outdoor unit on an extra small indoor coil, you are about guaranteed to have a charge imbalance that will require a tech adding and removing gas everytime the unit is switched between heat & cool.

And besides the forcing 4 tons of air through a small 3 ton coil, what about the 3 ton duct system. Most aren't big enough for what is there let alone hacking 33% more capacity without increasing supply, return and register capacity.

 

[BaldLoonie]

Now that all of you have chimed in I feel that I have presented her with some valid information.
Again,
Thank you

You're doing good, rare to get 100% in agreement on something