September 6, 2012

Though some people like to say that size doesn't matter, when it comes to your new HVAC system, the opposite holds true. Having your climate-control systems properly sized with Manual J load calculations is a crucial part of installation. In order to ensure maximum efficiency and effectiveness, you must insist that that your HVAC contractor is familiar with Manual J.

What is Manual J? In short, Manual J is a calculation tool that was developed by HVAC experts in order to accurately size heating and cooling systems for individual homes. These calculations allow your contractor to determine the exact amount of heat and moisture will need to be removed from your house on the hottest day of the summer, and how much heat will be required to warm your home on the coldest day of the winter. Load calculations are based upon a number of factors, including:

  • Local climate
  • Square footage of your home
  • Orientation of your home
  • Number of windows and their locations
  • Number and ages of household occupants
  • Heat-generating appliances and lighting
  • Personal comfort preferences

Why is Manual J necessary? You may be wondering why you can't simply pick the largest system and install it in your home. After all, bigger is better, right? In the case of your HVAC equipment however, this is not the case. Though HVAC systems that are too small for your space will not keep your home comfortable, a system that is too large will come with its own set of problems. Over-sized air conditioners are prone to cycling on and off frequently. This action can create problems with excess moisture due to the fact that an air conditioner running on short cycles will not be able to properly dehumidify your home. In addition to clammy conditions, your indoor air quality will decrease when excess moisture creates the potential for mold and mildew growth. On top of all of this, heating and cooling systems that are too big will eat a hole through your wallet by requiring excess energy to run. For more advice on Manual J calculations, contact the professionals at Russell's Heating and Cooling. We've been serving the Hampton Roads area of southeast Virginia since 1977. Our goal is to help educate our customers in Chesapeake, Virginia and surrounding areas about energy and home comfort issues (specific to HVAC systems).  For more information about Manual J and other HVAC topics, download our free Home Comfort Resource guide. Image courtesy of Shutterstock

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Russell's HVAC, HVAC service technician, VA

Regular annual maintenance keeps your system operating at peak efficiency. Experience has shown that a system that runs well keeps your utility costs in line — in fact, independent 3rd party research shows that you can save over $30 per month on utility bills.

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What Our Customers Are Saying

  • I can't complement your team enough on the wonderful job done with regard to the installation of the new system in our home. More specifically, we want to recognize the outstanding efforts of: Roberto-- the initial visit and diagnosis of the problem.

    Dan & Connie, Virginia Beach

  • I recently had your team install a new gas package unit including all new duct work at my house in Chesapeake. I had a split system that had undersized ducting which was removed by your installers.

    Mike & Sandi, Chesapeake, VA

  • We purchased a one time service for $79. They came out on time, checked out the geothermal system...they were very professional and kind.

    Nicholas H., Chesapeake, VA

  • We would like to thank your company for an excellent job. We are very pleased with the new (Mitsubishi ductless mini split) system that was installed last week. It works wonderfully at heating our home.

    Danny and Teresa S., Chesapeake, VA

  • Not one single idea for improvement. Keep doing what you do. OUTSTANDING!

    Charles J., Norfolk, VA

  • Great job!...World class employees!

    Colleen & Jim C., Suffolk, VA

  • Everything went great! This is the second big project we've had done through Russell's and we couldn't be more happy! We had the most dedicated, polite, and respectful crew! The team consisted of Elliot, Chase and Sean. Sean was here for the removal process on day one, and did awesome!

    J. Luhan, VA Beach

  • Hi Nate, please pass along our appreciation for you, Elliot and Steve. We are very happy with you being able to arrange our ( Lennox ) replacement system so quickly!

    T. Johnson, VA Beach

  • Thank you for running a top notch company and sending over to us two excellent folks Terry and Shawn. They did an awesome job putting in our new furnace system. Also thank you for Donald and Nate who did a superb job as well. Please reward these guys with some sort of commendations or rewards....

  • ...folks need to know how wonderful working with Russell's Heating & Air Conditioning is. They were very professional all the way thru the process of getting our unit installed down to the payment plan. I have been telling our neighbors and my co-workers about the experience.

    Pamela F., Chesapeake, VA

  • Every moment from the time an appointment was set up until the day the work was completed was a pleasure. Every employee was a delight to work with. The proof that the product was great came when the electric bills started coming in the airconditioning season.

    Douglas P., VA Beach

  • I am extremely satisfied with both the Lennox unit I purchased and the employees of Russell's. Even with poor window and door quality in this overly tired house, I am actually cooled off sufficiently enough to call it chilly.

    Robin W., Chesapeake, VA

  • Over the years I have gained the utmost trust in my service technician Corey Lesko's knowledge and work ethic while servicing my system.

  • I am writing this letter to commend your company on a great job! We were very pleased with how the company performed in every area...the installers did an impeccable job. They were very knowledgeable, efficient, and hard workers—staying focused to the task in the extreme heat.

    Pastor Larry E. O'Brien, Churchland Assembly of God

  • A year ago, I contracted with Russell's to tune up and clean the heating and cooling system. How impressively your specialist cleaned my system...he also found a defective automatic (programmable) thermostat. Quite quickly, he replaced my automatic thermostat. The results?

    R. Snider, Norfolk, VA

  • You recently installed a new Trane unit for us. We want you to know we are completely satisfied. The outside unit is now a hum versus the roar of the old one...we also want to recognize the installer...we cannot overstate what we think of his workmanship.

    K. Hawkins, Portsmouth, VA

  • Great and prompt service – as usual. Everything from ordering the a/c unit to installation went smoothly. Thanks for everything.

    B. Fenstermaker, VA Beach

  • Everyone was very nice. I felt well informed about my purchase. Your staff is great! I don't usually return opinion forms, but you need to know you have a staff you can be proud of!

    V. Horn, Chesapeake, VA

  • You have a new customer for life and I will definitely tell all my friends about your prompt, courteous service, your knowledgeable technicians, and your very reasonable prices. Thank you very much Russell's. You warmed much more than just my heart!

    G. Knoop, Chesapeake, VA

  • Your company was very responsive to my needs. The quality of your work was extremely high.

    Ms. Bright, Chesapeake, VA

  • Your workers actually made this total replacement project an enjoyable learning experience...they were always willing to stop and answer any questions. Their pleasant and cooperative attitudes cannot be praised enough!

    J. Wellons, Portsmouth, VA

  • Very pleased with both the price and service. The installation went off without a hitch and everything exceeded our expectations. When finished, the work areas, including the attic, were so clean you couldn't tell anything had been done.

    T. Marsh, VA Beach

  • Great expertise and timely service.

    H. Turbeville, Chesapeake, VA