Written A few things:Your air conditioning system does not have CFCs, they were banned decades ago.Even if your air conditioning did contain CFCs, running the air conditioning would not release any CFCs to the atmosphere. It is a working fluid inside the device, if it were leaking your air conditioning would soon cease functioning.The rate of cooling depends on a lot of things that can't be answered. Some air conditioning systems will output the lowest temperature reachable by the air conditioning system (which depends on outside air temperature), and do so until the room reaches setpoint; in this case, it makes no difference if you set it to 24°C or 4°C. Other systems will adapt the supply air temperature based on the selected temperature (commercial applications), in which case it does make a big difference what your selected temperature is.Written Many thermostats are simply on/off switches.  If it's hotter than the set point, then the AC is ON.  If it's colder, then it's OFF. 

You can set the temperature as low as you like.  All that will do is leave it ON.  Setting it colder can't turn it ON any more than it's already ON.  Some thermostats are more advanced than that.  They will increase the cooling power when the set point is a lot lower than the current temperature.  With that kind of thermostat, setting it colder will make it cool down faster.  How can you find out what kind of thermostat you have?  Slowly lower the set point and see if you hear a change in the operating condition of the AC.  Does it suddenly start blowing air faster?  Does the air coming out the vents feel colder?  Take a look at the thermostat and see if you can figure out how it works.  Can you see any obvious indication of multiple operating conditions? Written Written 1) What's constant is the rate at which the heat is transferred (dQ/dt) by AC 2) not the rate at which temperature (dT/dt) is decreasedUpdatedDo I need to drain my portable air conditioner? In most cases, your portable air conditioner will not need to be drained. 

Edgestar, Avallon and Koldfront portable air conditioners use a condensation exhaust system to expel water vapor collected during the dehumidifying/cooling process.  This moisture is released through the exhaust hose along with hot exhaust air. In extremely humid conditions, however, the water collected during this process cannot be exhausted quickly enough and may fill the internal water reservoir. price of an ac unitWhen this occurs, the unit will automatically shutoff to avoid overflowing the internal tank.  can i put a window ac unit on the floorYour specific unit may display an error code, alarm or indicator light when this condition occurs.  how to fix my home ac unitWhen this situation does occur you will need to drain the internal water tank. 

Each specific model has its own instructions for draining this internal tank however the basic steps detailed below will work for all models: To drain internal water tank: Find a drain pan or bucket or move the unit to a location where it can be drained into a sink. Locate the drain plug on the back or side of the unit. Remove the drain plug and rubber stopper to drain the water tank. **Please note: Once the drain plug is removed, water will begin to drain freely. To setup for continuous (gravity) drainage: Follow the above procedures to drain the unit initially. Measure the drain port opening and find a hose that is the correct width or thread type to secure to the drainage port of the unit. Locate a hose that will provide a water-tight fit. In certain cases a standard garden hose fitting will work.  Additionally, most hardware stores should have a hose type that will work for your unit. Route your drain hose to a suitable drainage location.