If homework was done correctly, this is your AHRI number
www.ahridirectory.org
System probably qualifies for the Federal Tax Credits and your states rebates, which is money in your pocket. Need to check minimum threshold in efficiency ratings of each of those program…
I would not sign a contract with whomever unless a startup/commisioning report was done, such as this guide.
Things like checking static pressures, temperature rise across HX, gas pressures, setting CFM, checking amprege draws of motors and compressor, final field refrigerant charge, etc. etc. are within manufacturers guidelines, typically found in the install guides of each section….