Would not make a comment without all model numbers including furnace, evap coil, outside condenser, thermostat and at least some idea of the scope of work involved for this replacement. Filter box, new lineset, etc

IMO

TD
Rheem Equipment:
Rcfl-hm3617cc - coil
14ajm36a01- condenser (w2913)
Rgpe-07namkr - furnace
New filter
New thermostat

Replacement installation:
Replace existing Carrier equipment
Use existing line set
New pad (plastic-like material on top of existing concrete pad)
Use existing ductwork

$11,000 that is a lot of money.
I would want a home energy efficiency audit; and heat loss heat gain load calculation; a thorough duct work evaluation and airflow testing to each room.

That new equipment must be awfully expensive compared to the 10 and 12-seer units I used to install.

They need to replace all of the refrigerant lines and install a matching evaporator coil, and of course, you'll want a thermostatic expansion valve metering device on the evaporator coil.

I believe Rheem has the Copeland Scroll Compressor.

Is very important to have the new equipment sized right; all put away to the free online load Calc. You have to read all of the instructions, get the square footage of the walls facing the outdoors the Windows plus the doors and what direction they face.

You can't save the load Calc when you got it completed, therefore, when you think you have it right print the results; then let us know what the results were when this forum.

Here is a link that might be useful: free whole house online load Calc

Derance

A nice two stage 80% eff furnace. Will require a two stage thermostat for best operation.

Don't believe that system qualifies for Fed Tax Credit. Wrong coil. See below system. It does qualify.

5584171 Active Systems RHEEM 14AJM SERIES RHEEM MANUFACTURING COMPANY 14AJM36 RCFL-A*3821 1050 RGPE-07?BRQ? 36800 13.00 16.00 1 RCU-A-CB 278 Yes

You should know that AC condenser is made South of the Border. I wouldn't have it.

Even for California, I think the pricing is absurd for a Rheem.

IMO