Plumbing broke and house almost caught fire. why won't our landlord fix this?

We have had numerous problems with our rented home for the year we've been there. Our lease states that our landlord is responsible for all major repairs, and we've kept all of our bills paid, yet our plumbing is clogged, the cental heat and air unit exploded because of exposed wires throughout the house,... show more We have had numerous problems with our rented home for the year we've been there. Our lease states that our landlord is responsible for all major repairs, and we've kept all of our bills paid, yet our plumbing is clogged, the cental heat and air unit exploded because of exposed wires throughout the house, and there is a huge beehive on one side of the house. The landlord admitted after we moved in that he's had problems with bees, plumbing, and electrical hazards for years, yet he said that now it is "our problem" and if we don't fix it, he'll sue to have it fixed for his next tenants (we are having to move because the house is really falling apart from all of the problems) This is his only renthouse and we are his first tenants. He also said that we can't get our security deposit back because he's already spent it. He also said that he never put any of our rent money into a separate account for possible repairs, and has spent the thousands we paid for rent over the year.
Update: I live in Oklahoma, and although one person stated that air is not a necessity, the Oklahoma Bar Association states that air conditioning is a basic tenant's right in oklahoma because of the extreme heat and drought in the summer. However, we had to buy our own ac's after the landlord provided us with old,... show more I live in Oklahoma, and although one person stated that air is not a necessity, the Oklahoma Bar Association states that air conditioning is a basic tenant's right in oklahoma because of the extreme heat and drought in the summer. However, we had to buy our own ac's after the landlord provided us with old, faulty ones that burnt out at the beginning of the summer (we're taking the ac's with us too) We're also renting to own the house we're about to move into, to avoid anymore landlord nightmares like this.
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