Ac Unit Temperature Drop Attic Duct

You should expect a 15 to 20 degree temperature differential from the air temp going in and the air temp coming out after the unit has been running a period of time.

Ac unit temperature drop attic duct.

The temperature your ac puts out is relative to the temperature you set on your thermostat. In addition to making the unit hard to get to for service high attic heat can trigger the high pressure limit switch turning your condenser off. Professionals call this temperature. If the temperature in your area rarely gets that hot wait until as hot a day as possible to test.

The result is that air your furnace or ac has already treated is losing energy back into the attic. If you ve studied heat transfer at all you may recall that the rate at which heat moves from a warmer to a cooler body depends on the temperature difference which we abbreviate as δt. It also means that the air in those ducts is continually exposed to the ambient temperature in the attic. Then allow the ac unit to run at least 15 minutes.

To reset the switch you ll need to climb up into. Ted also has inherited a powered attic ventilator. So even though there s no single ideal temperature you do want a 16 22 f difference from the supply air and return air. 2009 ashrae hof chapter 4 equation 48 pg 4 21 this calculator estimates the temperature drop or rise of air flowing in a duct.

I suggest you use 2 accurate thermometers. Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. Place the thermometer on a vent and leave it in. Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.

Put another into a supply duct as close to the unit as possible. That has kept the ventilator working but ted surmises the high temperatures are reducing the efficiency of his air conditioning equipment. So why put an hvac system up in the attic at all. Calculates the temperature change of air flowing in a duct reference.

Well mainly it s a way to save space. There too unless the supply duct is long uninsulated running in a hot space such as an attic the air temperature at the supply register should be around 55 degrees. Attic hvac systems save space. Instructions input information may generally be be obtained from design documents or field measurements.

Put one into a return duct closest to the unit as possible. Summer hasn t even arrived he notes in a post at gba s q a forum and when the temperature outside climbs to more than 95 f the temperature in the attic tops 120 f. An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan. The system should be blowing air that is noticeably cooler than the building s air.

Well there s not a universal fixed temperature your ac should always be blowing.