Depends on the outdoor temp. If it's 75 outside, your system should easily bring your house down to the 68 degree setpoint. If it's 100 degrees outside, you'll never get there. Unless, that is, your system is too big for your home. Then it will cool you down just fine, but you'll have humidity problems...that's a whole other discussion. Most central air conditioning units are designed to maintain a 75 degree indoor temp at 55% relative humidity on a 95 degree day. So a indoor/outdoor temperature difference of about 20 degrees or so is what you should expect.
I guess you have a heatpump or you would not be asking this. You need a set of freon pressure guages and the heater specs. Now you learn what the pressure lines are suppossed to be doing at the temperatures inside and outside and adjust the freon accordingly.
Houses need insulation to keep indoor temperature manageable. Without it, the heat or cool air conditioning a home owner puts inside will not be contained.
Running a room with the a/c on is not harmful to the system. In fact, it is a good way of saving energy. Most window or wall a/c's units have a dial or some other feature that opens a small trap door that lets air from outside be exchanged with stale air inside a room. One thing you must remember is that a fan cools a person not a room. Personally, we have a central a/c and keep a window in the bedroom open about 1/2 inch so air can circulate and not get stagnate. This also applies in the winter because it is one way to eliminate radon from building up.
R22 (commonly referred to by the brand Freon) is not a toxic substance. Its main danger would be the potential for oxygen displacement just as any other gas that is heavier than air, causing symptoms of asphyxiation. Some people may be highly sensitive to environmental substances in general, and have an asthmatic type response to R22. In the scope of a home system for example, unless the system is leaking the better portion of its charge in a matter of a day or two, there is no danger to the home or inhabitants. In rare cases, very rare, ammonia or an uncommon refrigerant could be used, but the majority of home A/C's for generations have been R22.
Usually there is a leak somewhere in the system.
it would be R-22.. brand new units will have the new refrigerant and that is R-410
Air conditioning units can be purchased at a variety of places. There are both window units as well as central air units. These can be purchased at stores such as Lowes, Home Depot, and even Best Buy if you are looking for a smaller unit.
There are many companies that will service home air conditioning units. One can get this service from 'The Home Depot', 'Sears Home Services' and 'Trane'.
Depends on the air conditioner. Older units use a form of Freon that is no longer manufactured, and you cannot buy it. Some window type units are sealed, and have no provision to add refrigerant. Your best bet will be to talk with the service staff at a local heating and air conditioning company.
Central air conditioning is an air conditioning system with a central unit that distributes air to the rest of the house through vents. Some people have air conditioning units that are separate for each room, but most houses today have a centralized unit, usually located outside the home, which pumps air to each part of the house through the ventilation system. That is what is referred to as Central Air conditioning, because there is just one centralized unit cooling the entire place, as opposed to many autonomous units cooling each room.
On the older ones they take R-22 freon and on the newer ones with 410 Puron freon..........
Actually no technical skills needed to check the Freon level. Home central air conditioners have a Freon scale on it. One just need to read the scale and determine whether the level of Freon is sufficient.
r-22 (gentron), and r-410a (puron)
It is advisable to call a technician to repair your air conditioning. He will solder the damaged pipe so that the freon wont leak anymore. Besides being dangerous, the lack of freon makes your air conditioner to work badly, and even stop refrigerating.
Mitsubishi Electic brand is top of the line for auto air conditioning units. You can find great deals on these units at Home Depot. They offer free consultations at your home.
R22 and R410 are common.