[JACKSONJAY]

I live in Louisiana and I have a Lennox heat pump unit at my house, the unit was there when I purchase the house in 1995. My question is will I have to replace the inside unit if I get a bigger unit outside? Any idea what something like this will costed, one service guy told me it will be around $5,000 to $6,000, to replace both.

Thanks in advance.

[KISS]

Evaporator/condensor coil located inside yes. The air handler, no.

Coils and outside units are matched.

[wmproop]

Is according to how much bigger, if you might have to replace the indoor blower motor,it needs to come close to matching the outdoor unit,, what I`m meaning you won`t get all it can give you if you have a 3 ton condenser and only a 2 ton blower

[KISS]

In that case it might make sense to evaluate the duct design with a Manual D calculation. Manual J does sizing.