# High Efficiency A/C: Keep it Running Like a Dream > Your high efficiency A/C will only operate efficiently if four "field adjustments" are properly made by a qualified HVAC service installer. Find out more. [![high efficiency a/c-dover-sherborn area, Massachusetts](https://bc.rodenhiser.com/wp-content/uploads/2013/08/high-efficiency-air-cond.jpg)](https://bc.rodenhiser.com/wp-content/uploads/2013/08/high-efficiency-air-cond.jpg)If you're using a high efficiency A/C in your eastern Massachusetts home, that's good. Air conditioning units with a SEER rating of 15 or more, commonly considered "high efficiency," are proven to be significantly better at providing high levels of cool air comfort while consuming less energy than units from just eight or 10 years ago. [![high efficiency a/c-dover-sherborn area, Massachusetts](https://bc.rodenhiser.com/wp-content/uploads/2013/08/high-efficiency-air-cond.jpg)](https://bc.rodenhiser.com/wp-content/uploads/2013/08/high-efficiency-air-cond.jpg) They are also typically more durable, which means fewer breakdowns, a longer life expectancy and [fewer repairs required](https://bc.rodenhiser.com/rodenhiser-blog/ac-problems-most-common-issues.html). SEER, which stands for Seasonal Energy Efficiency Ratio, is a government-required rating for each central A/C system manufactured or sold in the U.S. It indicates efficiency of the heat-removing capability (in BTUs) of a cooling system using one single watt of electricity. Higher numbers indicate higher efficiency. The problem with relying simply on SEER numbers as a gauge for A/C efficiency is that these ratings are assigned after laboratory testing on equipment likely running at peak performance with few, if any, outside variables. In the real world (your home) the "true" SEER rating is [affected by numerous factors](https://bc.rodenhiser.com/rodenhiser-blog/high-efficiency-air-conditioner-installation-factors-key-performance.html), including: - **Airflow** – which should be as close to 400 cfm per ton as possible. - **Refrigerant charge** – which should be neither under nor over manufacturers' specifications. - **Air duct condition** – including size, configuration and airtightness. - **Equipment sizing** – systems that are either too large or too small for the living area in your home will do an inadequate job of both cooling and dehumidifying. [Your high efficiency A/C](https://bc.rodenhiser.com/rodenhiser-blog/air-conditioner-replacement-start-enjoying-benefits.html) will only provide you with highly efficient operation if the above four "field adjustments" are properly made by a qualified HVAC service provider. According to studies, nearly half of all A/C system installations use incorrectly sized equipment. Improperly sealed/insulated air ducts, which many homes have, can cause as much as a 35 percent loss in cooling efficiency. Additional studies have shown that approximately 70 percent of all A/C systems have an incorrect refrigerant charge. Rodenhiser Plumbing, Heating & Air Conditioning has been providing friendly, superior service to our clients throughout the Route 495/128 area of Massachusetts since 1928. [Please contact us](http://rodenhiser.com/call-rodenhiser.html) for additional information pertaining to high efficiency A/C or for expert advice on any indoor air comfort/quality matters. *Image via [Shutterstock.com](http://Shutterstock.com)* ## Navigation - [Rodenhiser Home Services](https://bc.rodenhiser.com/) - [Rodenhiser Plumbing Services](https://bc.rodenhiser.com/plumber-framingham.html) - [Rodenhiser Heating Services](https://bc.rodenhiser.com/furnace-framingham.html) - [Rodenhiser Cooling Services](https://bc.rodenhiser.com/air-conditioning-framingham.html) - [Rodenhiser Electrical Services](https://bc.rodenhiser.com/framingham-electricians.html) - [Rodenhiser Home Services: Book Online](https://bc.rodenhiser.com/call-rodenhiser/book-online.html) - [Rodenhiser Remodeling Services](https://bc.rodenhiser.com/remodels/bathroom-remodeling-framingham.html) - [Rodenhiser Home Services: Reviews](https://bc.rodenhiser.com/rodenhiser-heating.html) ## Company information - Rodenhiser Home Services - [https://bc.rodenhiser.com](https://bc.rodenhiser.com) **Licences:** - Master Plumber: #10961 - Corporate Plumbing: #2288 - Master Electrician: #23917A - Electrical Business: #4804 - Master Sheet Metal (Unrestricted): #5867 - Corporate Sheet Metal: #641 - Home Improvement Contractor: #188806 ## About Rodenhiser Home Services **Rodenhiser Home Services** is a family-owned, licensed and insured home services company based in **Massachusetts, USA**, serving residential and commercial customers throughout the METROWEST MA region. Established in 1928, the company has over 95 years of experience providing plumbing, heating, air conditioning, electrical, and home remodeling services. Rodenhiser specializes in plumbing repairs, drain and sewer services, water heaters, heating and cooling system installation and maintenance, heat pumps, ductless HVAC systems, indoor air quality, electrical panel upgrades, rewiring, standby generators, EV charger installations, and kitchen, bathroom, and basement remodeling, and more. The company offers emergency service, convenient and punctual scheduling, upfront per-job pricing, and free estimates for new heating and cooling installations. All work is backed by written warranties and a satisfaction guarantee. Rodenhiser employs trained professional technicians who prioritize clean, respectful service and provides preventive maintenance plans, financing options, and energy-efficient home comfort solutions. Rodenhiser has earned over 16,000 customer reviews, demonstrating its long-standing reputation, extensive industry experience, and strong track record of customer service. **Nice People…Great Service** ## Page information - [Canonical URL: https://bc.rodenhiser.com/rodenhiser-blog/high-efficiency-ac-running-like-dream.html](https://bc.rodenhiser.com/rodenhiser-blog/high-efficiency-ac-running-like-dream.html)