What is you location? What a load calculation done? What thermostat has been quoted.

Most likely the right size for the AC is in the 3.5-4 ton range. A 5 ton AC would seem over sized.

It is difficult to comment on price because the tankless hot water heater is included. Even removing that the price does seem high. I would drop the UV light. It just a maintenance headache which does little for you. Is the air purifier an electronic cleaner? I would trade that in for a 4 inch media filter box.

Are you having humidity problems in the winter? Low humidity is usually caused by air infiltration. I would rather see you spend money in making the house tighter than adding a humidifier.

The Carrier 59SP5 furnace is a single stage model. I have concerns how it will work with your two zone system when only one zone is calling for heat. I think a 2-stage funace (multi or variable speed) would work more efficiently and quieter.

The load calcs were done, one called quote called for a 4 ton the other a 5 ton, the 5 ton was based/modified on the amount of registers.

The water heater is about $3500 as a stand alone item so figure $14,000 for heating and AC. The thermostats are ECOBEE's and are currently installed, I'm keeping those.The air purifier is electronic and the current system has a 5 inch media filter box.

Thanks for the comments much appreciated.

Location?... I would want another quote either from Carrier or sister company Bryant dealer for comparison purposes....I also suggest a quote from a plumbing company for the HW heater...I agree with Mike. I don't like that furnace selection.

IMO

South Jersey. Sorry

the 17.5 quote was the lower of 2 from completing Carrier dealers. The other was 1500 higher.

I agree that with a zoned system a multi-stage unit would be better.

In S. J, near shore or farther away? It might make a difference.

Im closer to Philadelphia than AC. Definitely inland.

Are you getting the tankless water heater in order to qualify for the NJ Energy Star program? Be aware that the prices under these programs are often inflated. People tend to buy things they don't need in order to qualify for a bigger rebate. I live in NJ and I am familiar on how it works. I personally don't care for it. I think most people are better off buying an HVAC system through a qualified dealer and not use the program.

The number of registers has no affect on the load calculation. The is a another calculation that should also be done. Some contractors do calculations because they are forced to do them under the energy star program. They either don't know how to do the calculations or don't want to spend the time to do it correctly. You know one of the calculations has to be wrong, and a good chance they are both wrong.

If you live near Mercer county I can send the contact of the Carrier dealer I use.

I'm down in Gloucester County but I do appreciate the offer. Thanks.