You likely qualify for free legal assistance from Virginia Legal Aid. Here is their website:
The condition in your rental may violate what is called the "warrantee of habitability". Every rental must be fit for human habitation. When heat and air condition (under some circumstances) malfunctions and makes the dwelling intolerable and the landlord fails or refuses to fix the problem, the warrantee is breach. This gives you leverage to demand that the problems be fixed by your landlord at no charge to you, or would allow you to terminate your lease immediately if they are not fixed.
I would first contact Virginia Legal Aid Society and discuss this matter with them. They can help you resolve the issue, if it is resolveable.
Please let me know if you have follow-up questions. I'll be available to help further.
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