927 Lee Road 268, Valley, AL (706) 773-9274

Rooftop External Duct Installation Instructions

Johns Manville’s XSPECT® ISOfoam APF board consists of a uniform closed-cell polyisocyanurate foam core bonded on each side with a foil facer. Polyiso provides one of the highest R-values per inch of any rigid insulation (R-6.0 at 1 inch). R means resistant to heat flow. JM XSPECT ISOfoam APF is produced with an EPA-compliant hydrocarbon-based blowing agent that has zero Ozone Depletion Potential (ODP) and virtually no Global Warming Potential (GWP); it also meets both CFC- and HCFC-free specification requirements. Polyiso is one of North America’s most widely used insulation products and has been cited by the EPA for its…


What Is the Difference between Rooftop Units and Other ACs?

When it comes to commercial air conditioning, the great workhorses are rooftop units. People are accustomed to seeing rows of air conditioner cabinets along the top of office and retail buildings. Some commercial buildings still use “split” systems that are similar to the ones seen in residential housing, while restaurants and bars often use ductless heat pumps that send conditioned air wall-mounted blowers that are connected to an outdoor condenser. But the rooftop unit, because of its space saving quality and ease of service, continues to be the most popular for business use. What actually differentiates rooftop units from other…


2015 IECC Commercial: Overview of the HVAC Requirements

This presentation by Eric Makela and Howard Wiig takes a detailed look at the changes in the 2015 IECC. They cover the financial impact, energy savings, and steps that contractors and engineers need to implement to adhere to code. Click here to download the presentation. https://news.jm.com/blog/mechanical-insulation/2015-iecc-commercial-overview-hvac-requirements


K-Value, U-Value, R-Value, C-Value

In most applications, the primary feature of a thermal insulation material is its ability to reduce heat exchange between a surface and the environment, or between one surface and another surface. This is known as having a low value for thermal conductivity. Generally, the lower a material’s thermal conductivity, the greater its ability to insulate for a given material thickness and set of conditions. If it is really that simple, then why are there so many different terms, such as K-value, U-value, R-value, and C-value? Here is an overview with relatively simple definitions. https://news.jm.com/blog/hvac-insulation/k-value-u-value-r-value-c-value


7 Major Differences between Residential and Commercial HVAC Systems

While both residential and commercial HVAC systems serve the same purpose of heating, ventilating and cooling, they vary drastically in terms of mechanism and parts. This is because addressing the need for comfort in a home varies drastically when compared to a work space. Following are 7 major differences between residential and commercial HVAC units… https://news.jm.com/blog/hvac-insulation/7-major-differences-between-residential-and-commercial-hvac-systems


Add Efficiency to Your Commercial HVAC System with These Small Changes

The average commercial building attributes 40% of its energy costs to heating, cooling, and ventilation, according to estimates from the US Department of Energy. For the typical office building, that equates to 7.5% of its annual operating expenses, on average. Finding efficiencies in your facility’s HVAC system can result in significant savings on operating costs. But it can also yield even bigger returns in non-energy benefits. Improvements in comfort, indoor air quality, and equipment reliability can all be achieved with HVAC maintenance and upgrades. No matter your industry, by improving your HVAC equipment you’ll find a way to improve your…

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