I am new to this site, and from what I have seen so far, it looks like a valuable resource that I can use.
As a design professional, I think I qualify as having "just enough knowledge to be dangerous", relative to HVAC equipment. But I think I also have enough sense to seek out professional consultation when necessary. This is one of those times.
So here's the situation. I am finishing off part of my basement (totally below grade) and the area to be conditioned is scheduled for a 2 ton heat pump and (upflow) electric AHU. I have consulted several (good) local HVAC contractors and they have confirmed that 2 tons is suitable for this project.
So, I have been shopping for used equipment for this project. The plans for the house do not justify the cost of new or newer high efficiency equipment. The investment/ ROI aspect is in the driver's seat for this decision. I can tolerate some diminished efficiency vs. the cost of the system, taking into account the potential for slightly higher utility bills.
I have located the following equipment, and it all appears to be in good to excellent working condition (all of the refrigerant systems were evacuated, and the lines sealed). All of the equipment can be purchased for around $200 for each one. I am aware that the following used pieces are older ones, and that there may be future maintenance issues versus a new system. The big question is compatibility between all of the components. The issue of the respective units' SEER ratings has been somewhat of an elusive issue for me, so all input is greatly appreciated. I have been told that it is not 'mandatory' that the units have identical ratings, but if they are not, there may be a nominal decrease in the overall system performance.
The (upflow) AHU that I am considering is a Payne model #PF1MNB024. If I have researched this correctly, it has a single speed blower with different CFM settings/ connections. It presently has no heating in it, so I am considering adding a Carrier #KFCEH0901N10 (10KW) heat strip, which is listed as an 'acceptable' accessory on the equipment label. The pictures I have seen of this heat strip shows two separate elements in it, so is it a one or two stage configuration? The coil in it is for R22 refrigerant.
The heat pump I am considering is a Carrier #38YKC024310, which I believe is a 1 stage unit. This unit is also set up for R22 refrigerant, and the manual indicates that it should be used with a variable speed fan coil. And my research has pointed me in the direction of a Carrier #TSATCCPHP01-B thermostat (which would likely be a new, rather than used, unit).
If all of these components with operate "in Harmony" with each other, then I will secure a local Carrier dealer to install them (I am not a HVAC guy by profession, so I don't go there!). The dealer will also install the supply air plenum and the takeoffs. The line set distance is not an issue, as the outdoor unit is to be located directly adjacent to the indoor AHU (< 15' of tubing).
So, I am here to solicit all of the valuable resources that are so apparent, to see if I am 'in the ballpark' with this plan, or if I need to reconsider some, or all of the units mentioned above. If you need anything further, just drop me a reply, and I will provide additional information as necessary (like if I have omitted something critical for an informed opinion!).
And, so I don't forget, thanks in advance for your help!