testing AC in winter? Find an InterNACHI certified Indiana Home Inspector (and anywhere else in North America) Re: testing AC in winter? Never and most HVAC techs won't do it either. Providing home inspections in Greensboro, High Point, Burlington and the surrounding areas. Home inspections in Raleigh, Durham, Cary, Chapel Hill, Apex and surrounding areas. Providing home inspections in Greensboro, Raleigh, Winston Salem. Originally Posted by dandersen LOL i do have that one, mine was good international actually . i have had it in 1996 i think, ill have to find it Home Inspection Reports Powered by: Originally Posted by eholliday It is not that you can�t run them it is more that you are operating them outside the normal design parameters. Typically (if you use your head) there is no need for air conditioning if outdoor ambient is below 70. (78 by my personal comfort zone not taking into account Relative Humidity) and I personally won�t evaluate them as a Home Inspector below 75 F outdoor and a minimum of 75 F indoor because you need the indoor heat loads, the main reason we all have air conditioning.

Many air conditioners are equipped with factory installed low ambient controls to prevent operation in low temperatures while with others it is an advisable option.split ac unit parts So if the a/c doesn�t start are you going to determine that the low ambient control is stopping it or are you going to bypass this control to determine if the a/c is operating satisfactory? my central ac unit will not turn onOr are you going to assume that it is not responding to the thermostat and recommend further evaluation? how a car air conditioner system worksOr are you going to say it is operating ok based on what,,,delta T? Yes air conditioners do run at temperatures below 60 with the proper accessories and depending on humidity they will utilize an economizer section for �free� cool air or the use of a head pressure controls to maintain reasonable operating pressures.

You are correct, the manufacturer does not say NOT to run below 60 BUT the references and tables given by the manufacturers to trouble shoot and diagnose is typically limited to a temperature range of 60 degrees F to 115 degrees F. Any adjustment of refrigerant outside this range is not recommended. Furthermore manufacturers recommend that operation below 60 F only with the use of appropriate accessories. Now given that, even if you have a heat pump (which does run in low ambient) that requires a refrigerant adjustment, a tech may ESTIMATE an adjustment of the refrigerant charge based on temperatures, pressures, installation and operating characteristics of that particular unit BUT the corrected charge should be re evaluated under normal air conditioning operating conditions typically 85 to 115 outdoor air. If you need residential air conditioning temperatures below 60 it�s called a walk in cooler, refrigerator or freezer. If you have an indoor load that requires air conditioning in a home when outdoor conditions are 60 or less open a window.