Please ensure Javascript is enabled for purposes of website accessibility

(717) 843-4311

Packaged HVAC Indoor vs Outdoor

There are two basic types of HVAC systems, that being packaged and split systems. In short, a split system model contains a condenser and compressor residing in an outdoor cabinet while connected to an indoor evaporator. They connection by copper tubing and include various line lengths depending on numerous factors. Packaged systems on the other […]

Improving Indoor air hygiene

Since the onset of the novel corona virus that has become a pandemic, there is emphasis placed on improving indoor hygiene. People across the globe now realize that prevention of illness needs to be part of the strategy to control infection. Although mask wearing and social distancing may reduce transmission it is not enough to solve […]

Understanding DOAS and comfort cooling differences

Your DOAS Solution

While indoor air quality and ventilation have been major focuses of the HVAC industry for a long time, many misconceptions remain about what these applications require in terms of equipment and design. Today’s post will parse some of the most common questions about DOAS and comfort cooling equipment. Purpose of DOAS A dedicated outside air […]

What is DOAS?

With Independence Day weekend approaching Americans are making plans to celebrate with cookouts, swimming, and other outdoors activities. These simple pleasures become even sweeter knowing that, when outside, we are breathing clean, fresh air. What some don’t know is that when we return to work, we are often returning to buildings that have been consciously […]

Choosing a Dedicated Outdoor Air System (DOAS)

In order to comply with current strict ventilation standards in the HVAC industry, manufacturers’ are introducing innovative new equipment to improve indoor air quality. Dedicated outdoor air systems (DOAS) are one such methods used to help regulate temperature and humidity. Schools, hospitals, offices, and other commercial spaces can all benefit from a DOAS unit. As […]

Dedicated Outside Air Systems (DOAS) part 3

DOAS and VRF The choice of installing an Indoor DOAS unit, especially if the existing HVAC system already includes provisions for OA, is for operating efficiencies.  Therefore they need to meet ventilation code requirements or occupant comfort. But we are now seeing new cooling technology being specified having no provisions for OA and requires a […]

Dedicated Outside Air Systems (DOAS) part 2

Adapting DOAS To Your HVAC System There is a proven method that will meet the challenges of complying with the ASHRAE Standards. This method delivers precise amounts of ventilation to spaces regardless of load size, and do it cost-effectively. Known specifically as Dedicated Outside Air Systems, or (DOAS), the conditioned outdoor air separates from the […]

Combining DOAS and VRF as an HVAC Solution

For decades, using Variable-air-volume (VAV) systems with air terminal units developed extensively in commercial/institutional buildings in the United States. Unfortunately, the optimized design of a VAV system with terminal heat is difficult at best. Mostly because of limitations inherent in VAV and complications posed by design standards and regulations. One new approach involves the pairing […]

Healthcare-Associated Infections: How can we help?

Indoor air pollutants can affect the health of children, the elderly and those with health problems and lead to infections. As people spend an extreme amount of time indoors, the air we breathe in closed-in spaces can further worsen health problems. For example, each and every day we are open to indoor impurities such as […]