Our experienced team offers services for both residential and commercial properties.With over 30 years of experience in the industry, we boast all of the knowledge and expertise in repairing.
Professional HVAC system installation for San Antonio homes and businesses. LG Mechanical installs high-efficiency heating and cooling systems with expert design, precise sizing, and code-compliant installation backed by our Master HVAC Contractor license. Whether you’re replacing an aging system, building new construction, or upgrading to energy-efficient equipment, our veteran-owned company brings 30+ years of installation expertise to every San Antonio project—ensuring your new HVAC system delivers optimal comfort, energy savings, and reliable performance for decades to come.
Proper HVAC installation requires far more than connecting equipment and running ductwork. LG Mechanical performs comprehensive load calculations using Manual J and Manual D industry standards to size your system correctly—preventing the comfort problems and efficiency losses caused by oversized or undersized equipment. We evaluate your property’s insulation, windows, orientation, occupancy, and San Antonio’s demanding climate to design HVAC solutions matched precisely to your needs. Our complete installation services include system design and equipment selection, load calculations and duct design, refrigerant line installation, electrical connections and thermostat wiring, startup and commissioning, and thorough performance testing to verify your system operates at rated efficiency.
We install all major HVAC brands including Carrier, Trane, Lennox, Rheem, Goodman, York, Daikin, and Mitsubishi—providing manufacturer-certified installation that protects your equipment warranty. Our installations serve residential properties from single-family homes to large estates, commercial facilities including offices and retail stores, new construction and major renovations, and system replacements for aging equipment. Every LG Mechanical installation meets San Antonio building codes, manufacturer specifications, and our veteran-owned standards for quality workmanship that you can trust.
Correct HVAC system sizing is critical to comfort and efficiency—yet most contractors skip proper load calculations and simply guess at equipment size. LG Mechanical performs Manual J load calculations for every installation, analyzing your property’s square footage, insulation values, window sizes, ceiling heights, and San Antonio’s climate data to determine exact heating and cooling requirements. This engineering approach ensures your new system is sized correctly.
Manual J Load Calculations for Precise System Sizing
Manual D Duct Design for Optimal Airflow Distribution
Equipment Selection Matched to Your Specific Needs
LG Mechanical’s Master HVAC Contractor certification represents the highest level of installation expertise in San Antonio. Our 30+ years of experience and veteran-owned commitment to excellence ensure every HVAC installation receives professional workmanship, proper refrigerant charging, code-compliant electrical connections, thorough commissioning, and performance testing that verifies your system operates at manufacturer-rated efficiency.
We guarantee our HVAC installations meet all manufacturer specifications, San Antonio building codes, and industry best practices. Every installation includes comprehensive workmanship warranty, manufacturer equipment warranty registration, thorough performance documentation, and our commitment to your long-term satisfaction. Your new system will perform as promised—guaranteed.
LG Mechanical’s Master HVAC Contractor license represents the pinnacle of HVAC installation certification in Texas. This advanced credential requires extensive technical knowledge, proven installation experience, comprehensive code understanding, and demonstrated expertise that separates master contractors from general installers. Owner Geno Anguiano brings 30+ years of installation experience to every San Antonio project—from simple residential replacements to complex commercial installations requiring advanced engineering. Our Master Contractor expertise means your HVAC installation receives proper load calculations, correct refrigerant charging (critical for efficiency and longevity), code-compliant electrical connections, professional ductwork modifications, and thorough commissioning that verifies every component operates correctly. We also hold manufacturer certifications for premium brands, ensuring factory-trained installation that protects your equipment warranty and maximizes system performance.
Oversized and undersized HVAC systems create serious comfort and efficiency problems—yet most San Antonio contractors skip proper load calculations and install equipment based on square footage rules of thumb or “replace with same size” approaches. This shortcut causes cycling problems (oversized systems), inadequate cooling (undersized systems), humidity issues, hot and cold spots, excessive energy consumption, and premature equipment failure. LG Mechanical performs Manual J load calculations for every installation, analyzing your specific property characteristics including insulation R-values, window solar heat gain, air infiltration rates, occupancy patterns, and internal heat loads. We calculate exact BTU requirements and match equipment capacity accordingly. This engineering approach typically reveals that homes need different sizes than assumed—sometimes smaller equipment than currently installed (saving money and improving efficiency), sometimes larger to address inadequate cooling. Properly sized systems run longer cycles for better dehumidification, consume less energy, provide more consistent temperatures, and last longer because they’re not over-stressed or short-cycling.
Reduce your San Antonio cooling costs with high-efficiency HVAC installations from LG Mechanical. Modern air conditioning systems offer SEER ratings up to 20+ (compared to 10-13 for older systems), meaning dramatically lower electricity consumption during our long, hot summers. We install premium efficiency equipment including variable-speed air conditioners that modulate capacity instead of simple on-off operation, two-stage heat pumps providing efficient heating and cooling, communicating systems with smart technology for optimal performance, and high-efficiency furnaces up to 98% AFUE for maximum heating efficiency. For San Antonio properties, high-efficiency cooling pays for itself through utility bill savings—often reducing cooling costs 30-50% compared to older equipment. We help you select the right efficiency level based on your budget, usage patterns, and expected payback period. Our installations also include programmable or smart thermostats, proper insulation around refrigerant lines, sealed duct connections, and commissioning that ensures your high-efficiency equipment actually delivers rated performance instead of just nameplate specifications.
LG Mechanical handles HVAC installations for all San Antonio property types—from single-family homes to large commercial facilities. Our residential installation services include central air conditioner replacements, heat pump installations (cooling and heating in one system), furnace installations and upgrades, dual fuel systems combining gas heating with electric heat pump, ductless mini split systems for room additions, and complete system replacements for homes with aging equipment. For commercial properties, we install rooftop units (RTU) for retail and office buildings, commercial-grade split systems, multi-zone HVAC for office spaces, restaurant and food service climate control, warehouse and industrial HVAC, and tenant improvement installations for commercial leases. We also specialize in new construction installations working directly with builders and developers, major renovation projects requiring complete system redesign, and upgrade installations where we remove old equipment and install modern high-efficiency systems. Every installation receives the same Master Contractor expertise regardless of project size.
Protect your HVAC investment with manufacturer-certified installation from LG Mechanical. We hold factory certifications for premium brands including Carrier Factory Authorized Dealer, Trane Comfort Specialist, Lennox Premier Dealer, Daikin Authorized Installer, and Mitsubishi Diamond Contractor. These certifications require extensive factory training, proven installation quality, and ongoing education—ensuring we install your equipment exactly to manufacturer specifications. Factory-certified installation is critical because improper installation voids equipment warranties, reduces efficiency, shortens equipment life, and creates performance problems. Our certified installations include proper refrigerant charging using manufacturer-specified superheat and subcooling targets (not guesswork), correct airflow across coils (typically 400 CFM per ton), manufacturer-approved electrical connections and disconnects, proper condensate drainage and trap installation, and complete startup procedures including performance verification. We register your warranty directly with manufacturers and provide documentation proving certified installation—protecting your warranty coverage and giving you peace of mind that your San Antonio HVAC investment is properly installed and fully protected.
