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Calculate the right HVAC size for your home in San Marcos, TX.
Design temperatures: 100°F summer / 40°F winter
Total conditioned living space
Cooling Load
58,667
BTU/hr
Heating Load
77,106
BTU/hr
Recommended Size
5 Ton
System Capacity
Est. Monthly Savings
$22
High-efficiency upgrade
Estimated System Cost
Equipment + professional installation
$17,500 - $32,500
Before rebates and incentives
This is a simplified estimate based on Manual J principles. An on-site assessment by a licensed HVAC contractor is required for accurate sizing. Factors like ductwork condition, air sealing, and specific window types affect the final recommendation.
By using this tool or submitting your information, you consent to be connected to a vetted local professional in our network. You may receive calls or texts at the number provided. Standard message and data rates may apply.
ASHRAE design conditions for 00005
Average costs in San Marcos
Typical homes in 00005
Federal Energy Efficiency Tax Credit
federal incentive • Expires 2032-12-31
Up to $2,000
HVAC service calls in San Marcos, TX typically range from $85 to $235 for standard repairs. Emergency service is available 24/7 at approximately $203.
Yes, most hvac work in San Marcos County requires a permit. The average permit cost is $75. Our licensed contractors handle all permit requirements.
Our network of 15+ licensed contractors in the San Marcos area offers average response times of 45 minutes. Emergency service is available 24/7.
HVAC sizing depends on your home's square footage, insulation, and local climate. With a summer design temperature of 100°F and winter design temp of 40°F in 00005, proper sizing is critical. Use our Manual J calculator above for an estimate.