​Heating & Cooling 101 How Central AC Systems Work The typical central air conditioning system is a split system, with an outdoor air conditioning, or "compressor-bearing unit" and an indoor coil, which is usually installed on top of the furnace in the home. Using electricity as its power source, the compressor pumps refrigerant through the system to gather heat and moisture from indoors and remove it from the home. Heat and moisture are removed from the home when warm air from inside the home is blown over the cooled indoor coil. The heat in the air transfers to the coil, thereby "cooling" the air. The heat that has transferred to the coil is then "pumped" to the exterior of the home, while the cooled air is pumped back inside, helping to maintain a comfortable indoor temperature. Central air conditioning can also be provided through a package unit or a Indoor comfort during warm weather – Central air conditioning helps keep your home cool and reduces humidity levels.

Cleaner air – As your central air conditioning system draws air out of various rooms in the house through return air ducts, the air is pulled through an air filter, which removes airborne particles such as dust and lint. Sophisticated filters may remove microscopic pollutants, as well. The filtered air is then routed to air supply duct-work that carries it back to rooms. Quieter operation – Because the compressor-bearing unit is located outside the home, the indoor noise level from its operation is much lower than that of a free-standing air conditioning unit. How a Heat Pump WorksWritten Static pressure in an HVAC unit refers to the pressure of the air in the duct work etc.   Our "normal" pressure outside is some measurement (I forget it has been years since school :p)  but the importance of static pressure and building pressure are due to the earth and outdoors having a relvant norm.  So you take the building pressure and the outdoor pressure and understand the importance through their relations. 

If you open the front door and the air rushes in then you have more pressure outside than inside.  This can lead to small leak issues in your building due to the slight vacuum that the building is in relative to the out doors.  What you want to have is slight pressure in your building that is higher than outdoors.  This creates a slight seal in the building of air pushing in any leaks outward, thus warding away small leaks around windows, doors, and elsewhere due to air pushing outwards.  This small steady loss of air due to building pressure being higher than outdoors is what makes static pressure important.If you had no HVAC and your building had a higher pressure than outdoors, you would have a slow leak of pressure to the outdoors and the pressure would normalize/ equalize.  Therefore, you need a slight static pressure inside your HVAC unit to be higher than inside your building, and higher than the outdoors.  Therefore you are consistently losing a bit of pressure to the outdoors but never getting equalized to the outdoor pressure.

So in short think of a hose shooting into an above ground pool, and a cute kid you want to keep happy floating in the pool, as a small leak in the pool at the bottom.  You want the hose to be flowing with water coming out to keep the pool filled just enough to compensate for the leak at the bottom of the pool to be a nonissue, that way the cute kid floating around the pool says happy and everyone wins!!how to clean my home ac unitSo the hose is your HVAC static pressure, influencing the building pressure.  should an ac unit be levelThe building pressure is the pool that is influenced by the leaks and the hose.  ac wall unit not workingThe leaks in the pool are the same as leaks in the building, but building leaks are not always something to fix or sole because pressure partially equalizes when a door is opened.

Written It is a measure of driving force of Fan. It is measured by a pitot tube kept perpendicular to the air flow where dynamic part of pressure(from velocity of air) is absent. Fan static pressure should be more or equal to the static pressure requirement of ducting system. Static pressure requirement of ducting system is found out by summing up pressure loss of each component.Written Static pressure is a measure of "how much is in there", and it usually makes most sense to talk about static pressure when we're talking water. With water, the pipe system is filled up - and then some, so the pressure will be like 1,5-4 bars depending on building height. You'll want at least 1 bar at the highest point - and that's 1 bar higher pressure than the atmospheric pressure.Why, does ye ask? See, the lower pressure is, the lower the boiling point is. If pressure gets too low, we'll start to see bubbles in the water, and they make a lot of noise and wear the pipes down. This might happen on a microscopical scale, and when water runs through a thermostat there'll be all sorts of nooks and corners for the water to cavitate in.

As it happens, 1 bar is a good rule of thumb for normal buildings.Static water pressure can also be measured in "meters of water", "kilopascals" or other things. It's best explained as "how high does the water squirt if you drill a hole in the top of a pipe" ... hence "meters of water".Once this is done, you start the pump and get the water moving. That creates a dynamic pressure. Don't get the two mixed up. You can sum them up to get the total pressure, if you want... but it is rarely used, at least not in HVAC.The pump must push the water enough to overcome the resistance in the pipes, radiators, valves and so forth. But it doesn't care about height of the building, because some water goes up and some water goes down again. This balances each other out, so the pump just needs to push the water through.This means, right in front of the pump, pressure will be low. Remember how to deal with it? Yep, spot on - make sure the pump sits in a place where static pressure is high enough to prevent cavitation.