Choosing an Air Conditioner

first_img RELATED ARTICLES Making decisionsA knowledgeable air conditioner salesperson should be able to help you pick out a quality room air conditioner. Insist on an Energy Star-listed model, ask about moisture removal, and then consider technical support, warranties, manufacturer reputation, and service in making your buying decision.With central air conditioners and heat pumps, talk with air conditioning contractors and suppliers, but be aware that specific contractors may push only those products they are most familiar with or manufacturers they represent. The latest mini-split air-source heat pumps from such manufacturers as Mitsubishi, Daikin, Panasonic, and Fujitsu offer—in my opinion—the best option available today.If the air conditioning contractor you contact doesn’t provide these systems, I would suggest that you seek out other contractors or suppliers before proceeding with a purchase. Moisture removal with air conditionersAll air conditioners remove moisture, as described in last week’s blog. While there are no federal requirements or measurement standards for moisture removal, most manufacturers list moisture removal in pints of water per hour. As a first step, you must properly size an air conditioner to achieve good moisture removal (see below). If humidity is a problem, look for models that are effective at moisture removal. Models with variable-speed motors are typically more effective at moisture removal.Discuss moisture removal with a dealer or air conditioning contractor. Your particular situation and humidity conditions may inform the product recommendations. Sizing air conditioners and heat pumpsParticularly with central air conditioners and heat pumps, sizing is key to successful performance. With an oversized unit, frequent on-off cycling will occur, efficiency will drop, and moisture removal will be poor. Sizing requires carrying out detailed cooling load calculations; it is not something that should be done using rules of thumb. The sizing of ducting with a central unit is also very important, both for efficient operation and noise control. SEER ratings for central air conditioners and heat pumpsCentral air conditioners and air-source heat pumps in cooling mode are typically rated on a seasonal bases using the seasonal energy efficiency rating (SEER). This is the total seasonal cooling output in Btus divided by the watt-hours of electricity consumption.Central air conditioners must have SEER ratings of 13.0 or higher; I don’t think there’s a minimum threshold for the cooling performance of heat pumps [see correction in comments below]. To qualify for the Energy Star standard, central air conditioners and air-source heat pumps both must have SEER ratings of 14.5 for split systems (separate indoor and outdoor components) or 14.0 for packaged units.The best central air conditioners and air-source heat pumps today have SEER ratings above 22. Room air conditioner efficiencies and performanceRoom air conditioner performance is reported as the Energy Efficiency Rating (EER), which is a measure of the energy output in Btus (British Thermal Units) per hour divided by the energy input in watts, assuming standard conditions (usually 95°F outside temperature and 50% relative humidity).Federally mandated efficiency requirements for room air conditioners vary depending on size, ranging from an EER of 8.5 for models over 20,000 Btu/hour to 9.8 for models in the 8,000 to 14,000 Btu/hour size. To meet the Energy Star standard in these size categories, the EER must be a minimum of 9.4 and 10.8, respectively. The thresholds are somewhat more relaxed for the smallest units.Today’s best room air conditioners have EERs over 11.5, but relatively few exceed 10.8.center_img Air Conditioner BasicsCalculating Cooling LoadsWindow-Mounted Air Conditioners Save Energy Alex is founder of BuildingGreen, Inc. and executive editor of Environmental Building News. He also coauthored BuildingGreen’s special report on windows that just came out. To keep up with Alex’s latest articles and musings, you can sign up for his Twitter feed. For whole-house cooling, central air conditioners or heat pumps are used, and chilled air is distributed through ducts. Heat pumps offer the advantage of being able to provide both cooling and heating—by reversing the refrigerant cycle seasonally. If I were putting in an air conditioning system and my budget allowed, I would install one of the new-generation mini-split air-source heat pumps. (Very significant for those of us in the Northeast, the cost of delivered heat from these heat pumps is usually lower than that of oil.) [Author’s note: Some modifications have been made since this blog was originally posted.]I have never owned an air conditioner, and I don’t have any immediate plans to change that. But if I did, what would I look for?For only occasional use and when you don’t want to spend more than $1,000, the options are limited to room air conditioners, which are most commonly installed in windows. These cool the rooms in which they are installed, though in a small house or one that’s very-well-insulated and tight, a single window unit may be able to cool much of the house.Most room air conditioners are either installed in a double-hung window or in an opening in the wall specially created for the air conditioner. Special models are available that can be used in casement windows, though installation is trickier.Window air conditioners are usually installed in the late spring or summer and removed in the fall. Because they don’t seal tightly in the window, they should not be left in place during the winter months, as they will result in cold drafts. Room air conditioners that fit into custom openings through the wall may be left in place as long as they are fairly well-sealing (most are not), and if they are removed the opening should be carefully sealed for the winter.last_img read more

Arsenal, United complete swap deal for Sanchez, Mkhitaryan

first_imgFILE – In this Thursday, Dec. 28, 2017 file photo, Arsenal’s Alexis Sanchez celebrates after scoring his side’s third goal of the game during their English Premier League soccer match against Crystal Palace at Selhurst Park stadium in London. Alexis Sanchez is close to joining Manchester United in what is set to be a rare swap deal among two of England’s top teams that will see Henrikh Mkhitaryan move to Arsenal. Both players were pictured by British newspapers Monday, Jan. 22, 2018 entering an office in Liverpool to update their work permits. (AP Photo/Alastair Grant, file)MANCHESTER, England — Alexis Sanchez joined Manchester United on Monday in a rare swap deal among two of England’s top teams that saw Henrikh Mkhitaryan move to Arsenal.“I am thrilled to be joining the biggest club in the world,” said Sanchez, a former Barcelona player who had an opportunity to join United’s neighbor and fierce Premier League rival, Manchester City.ADVERTISEMENT Slow and steady hope for near-extinct Bangladesh tortoises Read Next Brace for potentially devastating typhoon approaching PH – NDRRMC Mkhitaryan has been a marginal figure at United in recent months, with Jesse Lingard starting ahead of him behind Lukaku. He has five goals in 39 league appearances for United, rarely completing 90 minutes.The 29-year-old Mkhitaryan has previously said his favorite team was Arsenal and his impressive technique, allied with Wenger’s naturally attacking philosophy, should make him a good fit at the London club.“He creates chances, he defends well, he can absorb distances and he’s very committed as well,” Wenger said. “I must say he’s a player who has all the attributes.”Sanchez’s debut for United could come on Friday, in the FA Cup fourth-round match at fourth-tier Yeovil.Mkhitaryan is cup-tied in that competition, so could make his debut against Swansea next week. NEXT BLOCK ASIA 2.0 introduces GURUS AWARDS to recognize and reward industry influencers Don’t miss out on the latest news and information. Kammuri turning to super typhoon less likely but possible — Pagasa Globe Business launches leading cloud-enabled and hardware-agnostic conferencing platform in PH Real Madrid: Ronaldo face cut could have been worse Typhoon Kammuri accelerates, gains strength en route to PHcenter_img Signing Sanchez is being viewed as a real statement by United, like Eric Cantona joined in 1992 and Robin van Persie — who also arrived from Arsenal — in 2012. Beating City to the Chile forward will make his arrival all the more sweet for United fans and Mourinho.“Alexis is one of the best attacking players in the world,” Mourinho said. “He will bring his ambition, drive and personality, qualities that make a Manchester United player, and a player that makes the team stronger and the supporters proud of their club dimension and prestige.”City came close to signing Sanchez in August and looked to be the favorite to get him this month, only to end its interest in the forward following a rival bid from United. The Premier League leader said Sanchez and his agent increased their financial demands and that it didn’t want to destabilize the team by bringing in a player who would be its highest earner.City, the league leader by 12 points, didn’t particularly need Sanchez, who had entered the final six months of his contract at Arsenal. That wasn’t necessarily the case for United.Sanchez will add some dynamism and unpredictability to a front line that already includes Romelu Lukaku, Anthony Martial and Marcus Rashford. Mourinho tried unsuccessfully to sign a winger in the last offseason.ADVERTISEMENT Sports venues to be ready in time for SEA Games PLAY LIST 00:59Sports venues to be ready in time for SEA Games01:27Filipino athletes get grand send-off ahead of SEA Games00:50Trending Articles01:29Police teams find crossbows, bows in HK university01:35Panelo suggests discounted SEA Games tickets for students02:49Robredo: True leaders perform well despite having ‘uninspiring’ boss02:42PH underwater hockey team aims to make waves in SEA Games01:44Philippines marks anniversary of massacre with calls for justice01:19Fire erupts in Barangay Tatalon in Quezon City “The chance to play in this historic stadium (Old Trafford) and to work with (United manager) Jose Mourinho was something I could not turn down.”The transfers of the 29-year-old players were announced simultaneously, with Arsenal manager Arsene Wenger saying Mkhitaryan was a “very complete player.”FEATURED STORIESSPORTSWATCH: Drones light up sky in final leg of SEA Games torch runSPORTSLillard, Anthony lead Blazers over ThunderSPORTSMalditas save PH from shutout“It’s a dream come true,” Mkhitaryan said, “because I’ve always dreamed of playing for Arsenal.”No financial details were disclosed, but United said Mkhitaryan was joining as “part of the deal” to bring Sanchez to Old Trafford. 2 ‘newbie’ drug pushers fall in Lucena sting LATEST STORIES MOST READ John Lloyd Cruz a dashing guest at Vhong Navarro’s wedding Sanchez joined Arsenal from Barcelona in July 2014 for about 30 million pounds, choosing a move to London amid interest from Liverpool.He was the top scorer in two of his three completed seasons at Emirates Stadium and helped Arsenal win the FA Cup in 2015 and ’17, quickly becoming a favorite with the fans. However, with Sanchez happy to run down his contract, Wenger accepted the need to sell his star player.Wenger rejected the theory that Sanchez was disrupting the harmony in the Arsenal team in his final months there.“He’s a very professional player who has been committed until the last minute,” Wenger said. “In training, he was practicing with full power, so I never questioned that. I never had any doubts about that.”Before Arsenal, Sanchez scored 39 goals in his three seasons at Barcelona after joining from Italian club Udinese.Mkhitaryan was substituted at halftime of his first league start for United, setting the tone for what has turned out to be a disappointing spell after arriving in English soccer for $33.5 million and with a big reputation in 2016.Mkhitaryan moved to United from Borussia Dortmund, where he was the German league player of the year, but struggled to secure a regular place in the team under Mourinho except in the first few months of this season.The Armenia international scored 23 goals and set up 32 more in his last season at Dortmund but failed to reproduce anything close to those numbers at United.With injuries affecting Mkhitaryan in his early months at United, Mourinho said the player needed time to adjust to the physicality and intensity of the Premier League.He finished last season by scoring an acrobatic goal in United’s 2-0 win over Ajax in the Europa League final in Stockholm and began this season well, too, setting up five goals in his first three games. 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