I would buy a single speed Carrier system from Munn's. They are the best at servicing the 5-year labor and 10-year parts warranty. You mat get a lower price from another company and/or manufacturer, but they may not be as prompt when you need a warranty repair.

What is the reason you want to replace it?

Systems using R410A are no longer being manufactured. You may have trouble finding AHUs and condenensers to replace your system. If you can't then it may be very expensive since the linesets may have to be replaced as well.

If you provide more details, there may be a less expensive option.

It is 21 years old and I am interested in purchasing equipment that still uses the 410A refrigerant. I have heard that the newer type may be problematic/expensive to source.

I would avoid the new refrigerant if at all possible. I would start calling around to see if any company can procure a 410A system and install it. You might not have alot of options.

I have considered replacing my compressor since there are many identical
models available on eBay.It would be cheaper than replacing the whole condenser. Finding an evaporator may be more of a challenge.

Purchasing the compressor and evaporator from different vendors would not be easy since there are a number of parameters that have to be compatible.

Others may have better suggestions.

Give Chuck Farrel a call. He’s reasonable and will give you a good price.

I have similar size house, has mine replaced almost two years ago with simple carrier unit installed by Mumms. They replaced everything except ducting. Cost was around 8500. Rebuilt handler platform. My old trane was working fine but sprung small from leak which he to be serviced every 5 months or so and getting worse. Was cost effective spending 400 bucks every 4nor 5 months.

Thanks all for your helpful responses. I have been in touch with Chuck Farrell and think I am leaning towards a Champion unit made by Johnson Controls. Appreciate the feedback - STAY COOL this summer!!

I am curious. Have you received a quote from Munn's for a comparable Carrier system? I would consider both systems and contractors as being high quality. But, because both systems come with a 10-year warranty, I would be more interested in the reliability of the warranty service and availability of parts. Because Carrier is a much more common system in The Villages and Munn's is one of the largest Carrier dealers, I would want to use them unless the cost is way higher than the smaller company and less recognized system brand. I would even be willing to pay somewhat more for the Carrier system, if necessary. Just my opinion.

After 18 years, you are on borrowed time with AC units.