If one of your drains clogs, you may be able to resolve the issue using a drain cleaning tool or products intended to dissolve such blockages. Check your local hardware store for options, but please exercise caution. Certain corrosive chemicals may cause longterm damage to the system.
Toilet Won't Flush?
If your toilet isn't flushing properly, locate a plunger and use it to push any clogs through the pipes. You can also lift the cover on the back of the tank to make sure the chain is still connected to the handle.
If your air conditioning or heat isn't working properly, check your thermostat settings before doing anything else. It's surprisingly easy to accidentally change your settings, causing problems with the system.
Try to cycle the system on and off to resolve the HVAC issues.