hello friend i have early phase mention about the invention of ac today i will share about repair and maintenance of  AC and refrigerators but first we need to know about the type of refrigerator available in world which mainly 2 type 1)direct cool 2)frost free  Direct cool are those refrigerators which has single door but frost free have 2 separate door first one is older while 2 is newer version of fridge frost free is melting down the ice within 8 ours of running automatically in freezer or in evaporators,while direct cooling c cant do this process automatically generally we need to use thermostat switch after 16 days or stop the fridge after 16 days and open the door for an 2-3 ours by which ice will automatically melt down. Air conditioner is mainly 3 type 1)window type(old type)split (new type) and package initially centralize ac come in our society then split and package    

this system was mainly invented because for save food at the time of summer in 18th century . But at present we can see this system use in house, car, offices, railway compartment, Bus ext. Though it was invented in USA but presently we can see use of this system rapidly enhancing in all over the world specifically in Bakeries and ice cream manufacturing unit this system is very much important. Type of refrigeration’s and refrigerators Air conditioner, Water cooler , Bottle cooler , cold store, ice factory ,walk in cooler ext Unit of measurement kilo calories Type of refrigeration system 1)water vapour system ,absorption system, thermoelectric system and mechainal refrigeration system out of all system we use mechanical refrigeration system in 80 percent of case in later phase I will about the parts and component of mechanical system or absorption system

I have in early phase discussed about the invention of refrigeration ,today I will share something about why these system is important --------this

i wiĺl soon discuss about hvac repairings service thank you

hvac basic---------------hvac means heating ventilation air conditioner system is very important these days invented in usa in between 18-19 century initially it was invented because for preventing food stuff at summer from geting roted initiaaly ice cube used for this system but in late phase refrigarent was invented it was a basically compostion of sulphur+methyl+ammonia gas but due to their undesired properties gas was stop to used.after many phase at present clorine flourine carbone has been use for refrigarent gas

,ok just for check