HVAC services in MissouriAmerican Services HVAC installation in Saint Louis MO knows that if your HVAC equipment is oversized it can result in shortened equipment life, poor humidity control, and higher operating costs. All of these issues have a direct influence on your total cost of ownership, as well as your customers’ comfort level. Oversized HVAC systems can also negatively impact employee productivity and profitability of any organization.

There are several reasons that HVAC systems are oversized:

– Reliance on old name plate data
– Relying on old school rule of thumb formulas, which should only be utilized for general rough   estimate purposes.
– Lighting efficiency upgrades that have ultimately resulted in reduced internal heat generation operations within the commercial building.
– Insulation upgrades that have compromised building energy losses.
– Use of full load nameplate data of heating load generators, (computers, office equipment) even though the environment rarely, if ever, operates at full load.

Over-sized HVAC equipment not only results in higher operating cost but also increases the initial capital cost. An oversized unit can require more frequent cycling of the compressor, which will lead to premature equipment failure, with markedly increased energy expenditure. It can also require larger fans in ductwork, which can cause variation in occupant comfort because of the larger surface area, and the greater probability of system air leakage.  More importantly the coordination between the economizer and the compressor maybe exacerbated and destroyed.

Generally maintenance costs along with comfort problems follow a pattern.   Problems increase each year until the unit is about 20 years old. Owners usually decide at this time in the systems’ life between a major reworking, rebuilding of the existing system, or a completely new HVAC system installation.

One factor that can influence business owners in upgrading HVAC systems includes negative evaluation of the quality and efficiency of the original unit in comparison with the new design by HVAC professionals.

If the decision is to replace the HVAC rooftop unit caution should be taken to properly size the unit to the current cooling load requirements of the building rather than just matching the old design. This evaluation process should be performed by either a certified HVAC consulting engineer, experienced HVAC contractor, or trusted HVAC equipment supplier. Caution: this should not be attempted by an amateur technician.