Contact Us Southwest Mechanical Services POB 460769 San Antonio, TX 78246 830-980-4400 Thank you for your interest in Southwest Mechanical Services and a geothermal comfort system. Please fill out the form below and someone will contact you shortly. We'll answer any questions you have and can provide you with a free estimate for your unique geothermal situation in San Antonio and the surrounding region. Required Required Not a valid email Required Not a valid phone number Favorite Color Your Name Favorite Highway