My home air conditioner (american standard) freezes up constantly, will not turn off after reaching temperture

It continually runs until it freezes up resulting in not cooling because it frozen up. Do I need another thermostat or can the one i have be adjusted? Can your give me information on installing thermostat myself? How do i remove the one on the wall know? What type of thermostat do you recommend, one that is easy to install. What are the prices of thermostat. I have an american standard unit Thanks,|||I would check the furnace filters first. If filters are clean I would have the freon checked next. I don't think the thermostat is the problem but I would recommend the honeywell round mercury thermostat. They have the least amout of problems and last longer than any programable. New installation is fairly easy and honeywell provides instructions with their thermostats. $50 to $75.|||They freeze up because of lack of air flow through the coil. Make sure you have a clean filter. You may need to have your coil cleaned|||I think you have a slightly larger problem than a thermostat. Usually freeze up is a sign of low refrigerant charge. It could also be a dirty blower wheel, a blower wheel that is too slow, clogged air filter, or possibly a bad run capacitor on the compressor. Likely it is low refrigerant. This can be caused by a leak in the copper tubing (vibration at the condenser unit), a leak in the coils (either inside or out), leak at the service valve(s). Over time some gas will leak out of these valves.|||It sounds like you need a new thermostat. They are inexpensive and an easy diy project to replace. You should probably get a programmable one which can save you 10-15% on your heating/cooling bills. For a step by step replacement guide, check out my source.|||Every time Ive seen an AC freeze up, it was low on freon.|||Definitely sounds like your thermostat. That is what controls the running time of your A/C. When the thermostat doesn't tell the unit what temp it is, it just keeps running. The only temporary solution is to shut the unit off, allowing it to thaw, and restarting it. Replace the thermostat as soon as possible. I agree with Rick, the programmable thermostat is the most efficient. The round Honeywell variety is okay for single stage furnace use, but not recommended for two-stage and A/C if you want to run your units efficiently.|||if it freezes up that could be few things filters dirty, coils dirty, or freon is low.. running all the time could be tstat. to change tstat it is easy if need help you can e-mail me and i will give you the know how|||an air conditioner will not run until it freezes up without other problem yes your tstat is bad but the real problem is freezing up you have a problem with air flow dirty filter or evap coil blower not running at the right speed or your low on refrigerant get it checked out by a tech let them put on the t- stat you need them out anyway|||check your filter, if it is clean then your blower needs to be checked. Something is preventing flow over coil.