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There are several possibilities here. The new heat pump could be undersized for the area it is serving. Or it could be low on charge.
Not sure why they put a 5 ton air handler with a 3.5 ton condenser. This is not normal practice. Are you sure your installing tech set the air speed on the air handler for 3.5 ton?
I'd say your tech has missed something. There should be hotter air than that coming out.
If you are using the same company that installed this to service it, makes me wonder. I would never put a 5 ton air handler with a 3.5 ton condenser. Oversized and could run the air past the coil so quickly it won't pick up any heat.