Residential Energy Services for San Antonio & Central Texas Home Builders
Residential Energy Testing Made Simple
Building a new home or residential development? Lone Star helps you meet energy codes, avoid costly delays, and create spaces that are efficient, comfortable, and built to last. From planning to energy compliance, we streamline the process.
Certified. Trusted. Recognized.
Everything You Need to Stay Compliant and Efficient
We work closely with Texas builders and developers to provide reliable energy testing that meets today’s IECC standards and supports long-term efficiency across San Antonio, Austin, and the Hill Country. With over 15 years of experience in the field, we bring practical insight, clear communication, and a commitment to getting the job done right—every step of the way.
What’s at Risk When Energy Testing Falls Short?
Avoid surprises by partnering with a team that gets it right the first time.
What’s at Risk When Energy Testing Falls Short?
Avoid surprises by partnering with a team that gets it right the first time.
Efficiency From Start to Finish
From the first call to your final inspection report, we make the process smooth and seamless. Our team is committed to keeping your project on schedule and helping you build homes that meet the highest standards.
How It Works
Our Partners
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Our Residential Services
Identify and measure air leaks to meet IECC standards.
Verify that your ductwork is sealed properly to avoid energy loss.
Measure efficiency and stand out with proven performance.
Discover where your home wastes energy and how to fix it.
REScheck and Ekotrope modeling to confirm compliance before you build.
Let’s make energy testing the easiest part of your build. Connect with our team today.
Is Your Home as Efficient as It Could Be?
Our Home Energy Audit gives you a clear picture of how your home is performing—and where it might be costing you. Using specialized software and on-site testing, we identify inefficiencies, air leaks, insulation gaps, and other issues that impact your comfort and utility bills.
Whether you’re planning upgrades or just want to better understand your energy usage, this audit can help you make smart, cost-effective decisions.
FAQ's
How do you test a blower door?
A blower door is a diagnostic tool to determine a building’s airtightness. By measuring the extent to which air can flow into and out of a building, the blower door makes it possible to quantify a building’s airtightness. The test is performed by hanging the blower door frame in a doorway and attaching the door panel to the frame. Once the door panel is sealed, the blower door fan is turned on, and the pressure within the building is monitored. The extent to which air can flow into or out of the building is then calculated based on the change in pressure. Blower doors are essential for diagnosing building tightness and ensuring that homes and other structures are adequately sealed.
Is a blower door test worth it?
The test provides valuable information about the building envelope’s ability to resist air leakage, which can lead to energy loss, drafts, and other problems. In addition, the results of the test can be used to determine where air sealing and/or insulation improvements are needed.
While a blower door test is not required by code, it is highly recommended for new construction and major renovations. The test cost is typically around $300-500, but can vary depending on the size and complexity of the building.
What does a blower door test check?
A blower door test is a diagnostic tool used to assess the airtightness of a building envelope. The test involves mounting an airtight frame with a calibrated fan in an exterior door opening. The fan is used to pressurize or depressurize the interior of the building, and the resulting air movement is measured to determine the airtightness of the building envelope. The test is repeated at different pressures to ensure accuracy.
How long does it take to do a blower door test?
A blower door test typically takes 30 minutes to one hour to complete. The time required can vary depending on the size and type of home, as well as amount of required observation by the technician performing the test. However, most homeowners can expect the entire process to take no longer than 2 hours.
Can you be inside during a blower door test?
The answer is yes. You can be inside the house during a blower door test. The test involves sealing all doors and windows, then running a large fan in the front door. This depressurizes the house, which makes it easier to find air leaks. Individuals can walk around the home and feel for where the air leakage is coming from.
How hard is it to pass a blower door test?
This depends on how well your home is insulated and air sealed. If your home is not well insulated or has a lot of leaks, it can be quite difficult to pass a blower door test. However, if your home is well insulated and airtight, it should be relatively easy to pass a blower door test. Either way, it is always a good idea to consult with a professional energy auditor before attempting to perform a blower door test.
What is a good blower door test score?
It depends on what climate zone the dwelling is located in to meet code compliance. If in climate zone 0-2, the required result is 5.0 ACH (air changes per hour). If in climate zone 3-8, the necessary result is 3.0 ACH. Please check in with our energy team to learn about which climate zone your project is in.
Are energy audits worth it?
Yes, energy audits are definitely worth it! Here are three reasons why:
1. Energy audits can help you save money on your energy bills.
2. Energy audits can help you find ways to reduce your carbon footprint.
3. Energy audits can help you improve the overall efficiency of your home or business.
What are the three types of energy audits?
1. Whole-house/building energy audits
2. Systems energy audits
3. Equipment energy audits
What does an energy audit do?
An energy audit is an inspection, survey, and analysis of energy flows to reduce energy costs and consumption. It covers all forms of energy used in a facility, such as electricity, natural gas, oil, water, and solar.
The auditor will first assess the energy usage of the facility to identify where there are opportunities for energy efficiency improvements. They will then recommend measures to reduce energy consumption and costs. These measures may include installing more efficient lighting, heating, and cooling systems, or improving the insulation of the building.
What gets tested in an energy audit?
An Energy Audit will test the energy efficiency of your home, and make recommendations for improvements. The auditor will look at your home’s:
-Heating and cooling systems
-Insulation
-Windows and doors
-Ventilation
-Appliances
-Lighting
-Water heating
-Other factors that affect energy use
What is acceptable duct leakage?
The answer to this question depends on several factors, including the climate, the type of insulation, and the purpose of the ductwork. IECC required that a duct system should not have more than 4% leakage.
How does a duct leakage test work?
Duct leakage testing is performed to measure the airtightness of HVAC ductwork. This type of testing is important because leaks in the ductwork can lead to decreased efficiency of the HVAC system, as well as increased energy costs.
To perform a duct leakage test, a fan is used to pressurize the ductwork and a calibrated manometer is used to measure the pressure differential across the ductwork. The test is typically conducted at two different pressures, typically -0.1 and -0.4 inches w.c. (water column).
The results of the duct leakage test are reported as a CFM (cubic feet per minute). 4% duct leakage per 1,000 sq feet result is what would pass IECC code.
How do you check for duct leaks?
To check for duct leaks, you will need to do a few things. First, you will need to make sure that all of the registers in your home are clean and unobstructed. Next, you will need to inspect all of the ductwork in your home for any signs of damage or leaks. Finally, you will need to test the ductwork for air tightness.
If you find any leaks in your ductwork, you will need to repair them as soon as possible. Leaks in your ductwork can lead to a loss of heating and cooling efficiency, and can also lead to higher energy bills.
How do you fix a leaky duct?
If you have a leaky duct, the best way to fix it is to seal the leaks with mastic or metal tape. You can also use a sealant that is compatible with your duct material. Once you have sealed the leaks, make sure that the area around the duct is well-ventilated so that the mastic or tape can dry properly. Consult with our team at LSEE and we will help determine if the leak is repairable.
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