Just a few short years ago, natural gas was the way to go. We had to get off “dirty” oil or coal combustion to supply heat or power and switch to “clean” natural gas. After all, gas is cheaper, emits less greenhouse gases (GHGs) and toxic pollutants, is easier to maintain, and results in less wear and tear on equipment than oil or coal. Over the last decade many buildings made the switch to natural gas.

But, as it turned out, that led to problems. Despite plentiful natural gas due to fracking, some parts of the country developed shortages, particularly during cold winter periods. Also, while demand for natural gas grew, the infrastructure to bring gas to customers did not. As usual, infrastructure upgrades are not “sexy” and lag behind short-term growth.

Now, many utilities acknowledge that the necessary upgrades to gas infrastructure are too expensive and will take too long. For some, their coping strategy is to reduce natural gas demand – encourage buildings to get off gas and use other ways to heat.

Examples of other heating and cooling technologies include air source heat pumps (ASHPs), ground source heat pumps (GSHPs, or geothermal heat pumps), and solar hot water (SHW). These are proven technologies that have come down in price and are now incentivized in many places. They offer a number of benefits, including energy cost savings, increased comfort levels, and health benefits compared to gas combustion.

ASHPs provide efficient space heating and cooling to residential and commercial buildings, even in cold climates. An ASHP transfers heat from outside to inside a building, or vice versa, using a refrigerant involving a compressor and a condenser. Heat from outdoor air (even if cool) is absorbed by the refrigerant and released inside for heating. Similarly, heat from indoor air is transferred outdoors for cooling.

GSHPs also provide space heating and cooling, and, in some cases, using an indoor heat pump and a heat exchange ground loop buried underground to transfer heat between the ground and the building. Underground the temperature is normally constant around 51⁰F. That can be a source to cool indoor air in the summer or a source of warmth to bring to a building in the winter. Geology must be considered and space available to access the long piping needed to bring air back and forth from the building to an area below ground. The main energy use is electricity for fans, not a huge expenditure or greenhouse gas creator compared to gas combustion.

SHW collects thermal energy from the Sun to heat water for space heating, domestic hot water, and pool heating. Buildings that do not have sufficient roof space for a solar PV (electric) system may still have enough for SHW. Water is piped into an area below the SHW for heating. Solar air heating systems heat outside air drawn in. Temperature can be raised as much as 100⁰F before being ducted into the building’s HVAC system.

Historically, ASHPs and GSHPs have been quite expensive. Capital costs and O&M for such equipment have come down in recent years. In addition, many states and utilities offer robust monetary incentives to owners that install such systems, as they are trying to reduce their need to upgrade gas infrastructure and meet GHG reduction goals.

Given the challenges of gas and the gains in these technologies, it is worth it for a building owner to examine whether a “clean” technology is financially beneficial.

For those of you in Westchester County, NY considering clean heating & cooling technology, see https://sustainablewestchester.org/hscommercial/.

In Putnam County, NY, contact Bonnie@BrightEnergyServices.com to learn about the equipment and strong incentives.

CCES has the technical experts to help you determine whether you are a good candidate for a clean heating & cooling technology and whether it is financially beneficial to you in the short- and long-term to get rid of natural gas combustion and benefit from these systems. We can help you get the maximum incentives available. Contact us today at Karell@CCESworld.com or 914-584-6720.