Tech was out for an inspection on mother-in-law suite system is a 2021. Tech check in the system and notice a couple of issues. Furnace is oversized for the square footage for the mother-in-law suite. Recommended furnace is 36 BTUs. System is going off on high limit due to oversize furnace and as well as undersize return. CFM on equipment now is 780. The equipment is 2 1/2 ton. This calls for 1000 to 1250 CFM. System is short on return by 470 CFM. Let customer know that the system is working twice as hard as it should due to lack of return and oversized furnace. There is no safety switches on the Evaporator or drain pan. Let customer know in order to correct these issues would have to replace the furnace with a 36 BTU. Add return to the system as well as adding a supply vent in her room. Customer declined repairs as well as having someone out to give her a quote on a correct size furnace at this time system is operating but not efficiently.