Articles Tagged with ''air conditioning''

The Case for Hard Start Kits

During my 50 years in the HVAC trade, I have found that most technicians do not spend time learning about the compressor and the a/c system as much as they should. In their defense, they are simply too busy to take the time once they are out of school.


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Going Against the $29 Tune-Up

Many contractors (and big-box stores) try to grab customers’ attention by advertising the ubiquitous $29 tune-up. So is the $29 tune-up an effective marketing tool that can be used to beef up the customer base? Or is it a pernicious practice that lowers the bar for the HVAC industry? It all depends on your outlook.


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The Professor: The Needed Amount of Condenser Subcooling

The amount of condenser subcooling needed is system dependent. The more pressure drops — friction and static — associated with the lines and accessories that carry the liquid in the system, the more need there will be for liquid subcooling to prevent liquid line flash gas.


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Atlas Sales & Rentals Inc.: Portable Air Conditioner

At 34 inches wide, the PACSlim-12 air-cooled portable air conditioner can roll through a standard doorway. The unit provides 12 tons (144,000 Btuh) of cooling. High-efficiency radial blowers with built-in variable-speed motors provide uniform airflow across the evaporator coil of the portable cooler.


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Two New Refrigeration Terms That You’ll Want to Know

Move over compression ratio, ring valve, and reciprocating compressors. There are two new terms to add to your refrigeration terminology: ‘bi-volt’ and ‘spool.’ The words relate to some of the newest developments in compressor applications.


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Letters From Our Readers: March 26, 2012

The first comment is in response to Peter Powell’s editorial “Is A/C to Blame for D.C.’s Mess?” in the Feb. 6 issue. The second concerns what contractors are doing about the rising cost of gas.


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March 6, 2012: Honolulu Seawater Air Conditioning Granted Easement for New Chilled Water Project

Honolulu Seawater Air Conditioning LLC (HSWAC) announced that the Hawaii Community Development Authority (HCDA) approved to enter into a Grant of Non-Exclusive Easement and Construction Right of Entry in Kakaako makai lands for the underground piping of the company’s seawater air conditioning project for Honolulu.


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The Professor: Why Is Condenser Subcooling Needed?

Condenser subcooling ensures that there is a liquid seal at the condenser’s bottom so the liquid line or receiver will not be fed with vapors. This condition prevents any noncondensables, like refrigerant vapor or air, from leaving the condenser’s bottom and entering the receiver or liquid line.


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CEE Revises Efficiency Initiative

The Consortium for Energy Efficiency (CEE) released its revised “High Efficiency Commercial Air Conditioning and Heat Pump Initiative.” The initiative includes a high-efficiency energy performance specification for commercial air conditioning and heat pump equipment.


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Rewards Contest Winner

Custom Design Heating and Cooling owner Josh Hipke recently awarded 21-year-old college student Matthew Bowen a Coleman 14.5 SEER LX Series MicroChannel air conditioner as a reward for winning the dealer’s Survival of the Coolest contest at the Lincoln County Fair in Merrill, Wis.


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2014 World Energy Engineering Congress

Scenes from the 2014 World Energy Engineering Congress in Washington, D.C.

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NEWSMakers: Matt Barga

Matt Barga, portfolio manager — a/c and coils, Ingersoll Rand, discusses how the company is working to comply with the new energy conservation standards for heat pumps and air conditioners that go into effect on Jan. 1, 2015. Posted on Dec. 19.

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HVAC TECHNICIAN SHORTAGE

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2015 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

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