OK.

This is getting detailed enough, that answering will tricky without more information.

What kind of pool do you have? How old is the liner? What type and size piping (OD) do you have?

What kind of filter do you have? (exact model)

Do you want to HEAT your pool, or just WARM it? In which months?
(Actually HEATING a pool in Connecticut is EXPENSIVE!)

And, pictures. Post pictures! Instructions here: pool9.net/postpix/


PS. Pool store enthusiasm for VS pumps has more to do with $ales performance, than with pool performance! VS pumps may be more efficient than 2 speed pumps, but often are not as actually installed. But VS pumps are NEVER more reliable than equivalent grade 2-speeds!