Landlord using shortcuts to fix air quality systems

When the last tenant moved out, my landlord was in a hurry to have the next tenant move in.

I found the house a week after the last tenant had moved out, and I requested the landlord to take his time to renovate the house.

After paying the deposit, I waited for another 2 weeks to move in. The work was shoddy and I couldn’t turn back because I had given the notice to vacate my previous dwelling. The HVAC service wasn’t complete by the time I moved in. The a/c workman I found performing the air conditioning installation confirmed to me that he was working there for the second day straight. The HVAC equipment he was installing arrived late and I wasn’t supposed to see them either. When he was done, the landlord didn’t bother to inspect his work and being a novice, I couldn’t tell if it worked well until I noticed the radiant heater wasn’t radiating enough heat but the cooling system worked perfectly. My calls to the landlord went unanswered, so I took it upon myself to find an HVAC contractor from a nearby HVAC business to come and assess the air quality systems. It turned out the supposedly new HVAC was nowhere near quality HVAC. The seer ratings were much lower than expected. His advice was that I get a portable space heater and possibly sign up for an air conditioner service plan. I took his advice because there was no way I was going to convince the landlord to undo the mess, let alone be able to afford the equipment myself.
electric furnace