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Calculate the right HVAC size for your home in Durham, NH.
Design temperatures: 90°F summer / 2°F winter
Total conditioned living space
Cooling Load
38,858
BTU/hr
Heating Load
196,447
BTU/hr
Recommended Size
3.5 Ton
System Capacity
Est. Monthly Savings
$15
High-efficiency upgrade
Estimated System Cost
Equipment + professional installation
$12,250 - $22,750
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 27709
Average costs in Durham
Typical homes in 27709
Federal Energy Efficiency Tax Credit
federal incentive • Expires 2032-12-31
Up to $2,000
HVAC service calls in Durham, NH typically range from $111 to $261 for standard repairs. Emergency service is available 24/7 at approximately $242.
Yes, most hvac work in Durham County requires a permit. The average permit cost is $75. Our licensed contractors handle all permit requirements.
Our network of 17+ licensed contractors in the Durham area offers average response times of 52 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 90°F and winter design temp of 2°F in 27709, proper sizing is critical. Use our Manual J calculator above for an estimate.