The Seller did sign and give us a Residential Property Condition Disclosure where it was stated that the Seller was not aware of an defects/malfunctions in the central heating.

Your example of "what if I said the house was yours to keep" doesn't hold water because no one would consider that a fair exchange but many people would see the exchange of a month of rent for a couple weeks of a malfunctioning fridge reasonable, especially since you made the offer.

First 48 Offers uses AI-powered systems to monitor properties and alert managers to potential issues, such as leaks or HVAC malfunctions, before they become serious problems.Enhancing Customer Experience: AI technology is also improving customer service in the real estate industry.

I think sensors on the all the appliances, plumbing, smoke detectors and windows that send an email to the landlord when it's malfunctioning would be great if it were not too expensive.

Next, the brand new fridge began to malfunction, the service tech appointed by the company (Frigidaire) said it could be up to a month before the part came in, so I bought a new fridge and had it installed immediately.  

Tenant agrees to allow Landlord timely access to premises to do maintenance and repair.Tenant will notify Landlord in a timely manner of any damages or problems as they arise, including damages caused by Tenant, malfunction of appliances or fixtures, and water/moisture leaks and spots.Tenant will take care of the premises, keeping them clean and clear of debris.

You need to go on automatic delivery.Phone service:Keep in mind that missing phone jacks or bad or malfunctioning phone wiring are the responsibility of the tenant.

I have managed numerous properties with key less entrance or codes and lot of time it malfunctions or outside guest just use the code to get in.

Mario Mormile , my experience is that the fancier the thermostat, the more service calls you will have...due to operator error, not a malfunctioning thermostat.

An uncommon but possible scenario is a  humidifier installed in the hvac system that is malfunctioning or was turned the whole way up.