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 We're dedicated to Commercial Property Inspections, Phase 1 & 2 Environmental Site Assessments, for Austin, San Antonio, and surrounding Texas areas. Call us today.

                                                Our Services Below

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                    Building Inspections 
     We only inspect Commercial Properties. Buildings are 
   evaluated by ex-builders 
and civil engineers with decades  
   of experience
 in commercial construction. We cover all 
 of building systems, including Structural, HVAC,
   Plumbing, Electrical, Efficiency, Elevators, and
   ADA Compliance. Property Condition Assessments.

                   Phase 1 & 2 Environmental
                          Site Assessments 
      An environmental site assessment is a report commonly prepared 
  for a commercial real estate
transaction that identifies potential or 
environmental contamination liabilities.
 Our site
  assessments follow ASTME Standards, and reports are easy to 
  read with the conlusions summary at the beginning of the report for
  faster answers.

We perform ADA compliance inspections for Austin, San Antonio, and surrounding areas

                              ADA Inspections
     Don't be a victim of a Drive-By Lawsuit. Our comprehensive report &
     photos will identify basic accessibility issues, and provide solutions 
     for existing buildings in order to meet basic standards under the 

We provide thermal image scans of commercial buildingsWe provide thermal imaging scans of commercial buildiings

                         Infrared Thermal Scanning
     Building envelope air leaks, moisture intrusion, and substandard
    work are costly to commercial building owners. An infrared thermal
    scan helps you quickly see and find the sources of energy
    defficiencies, destructive water damage, and structural issues so
    that you can make informed decisions on needed repairs that can
    help save energy and keep the building comfortable.


Education Section:

How HVAC Rooftop Units Work
Lester Shen; Mark Hancock; Huma Saqib - August, 2013

On most commercial buildings you will find roof top units (RTUs), air handlers that provide heating, cooling, and ventilation to the building’s conditioned spaces. Heating and air conditioning account for over 25 percent of the energy use of commercial buildings, and rooftop units serve 40 percent of commercial floorspace.

Cooling and Heating

When the space calls for cooling, a blower in the RTU draws warm air from the space below, through the cooling coil, and then supplies the space below with the cooled air.

A similar process occurs to provide heated air.  



RTUs also ventilate the space, always supplying some outside air. Notice in the animation below that the outside air damper is no longer fully closed, which allows the RTU fan to bring in a minimum amount of outside air. Notice the addition of pressure relief for the added outside air.

A space with people in it requires more ventilation than when it’s unoccupied. An occupancy sensor or a CO2 sensor can respond to changes in ventilation demand, controlling the outside air damper and bringing in more air as necessary.

RTU and Economizer Operation

An economizer is a control system that takes advantage of outside air conditions to save energy when cooling is called for in the conditioned space. When the outside air temperature is lower than the space temperature, the economizer opens the outside air damper of the RTU and brings in cool air. This saves energy, because otherwise the RTU would cool the inside air mechanically.

The following animation shows the standard operation of an RTU with an economizer. It also shows the operation of the compressor that is connected to the cooling coil. In standard operation, both the compressor and the fan run at a constant speed.

The final animation shows optimized operation of the RTU, where the fan and compressor speeds are modulated based on the conditioning demand of the space. Under normal conditions, this approach leads to the most energy efficient operation of the RTU.

Feel free to link to or embed these videos from this page or our YouTube channel.

The motion graphics animations were designed and produced by Huma Saqib.




Service Areas: 

San Antonio
Fort Worth
El Paso
College Station
Round Rock
Cedar Park
New Braunfels
San Marcos

Sugar Land
Chorpus Christi

Hours of Operation:

Mon–Fri   9am – 6 p.m.