HVAC Calculators & Tools
Professional HVAC calculators for load calculations, BTU sizing, equipment selection, duct design, cost estimates, and financing. All tools follow industry standards including Manual J, ASHRAE guidelines, and local building codes.
BTU Calculator
Quick BTU sizing for air conditioners and heaters based on room size, climate, and building details.
Window AC Size Calculator
Calculate the perfect BTU capacity for window and portable air conditioners based on room size and conditions.
Key Features:
- Window AC sizing
- Portable AC sizing
- Room-specific calculations
- Energy efficiency tips
Duct Sizing Calculator
Professional ductulator tool for calculating round and rectangular duct sizes based on CFM and velocity.
Mini-Split Calculator
Size ductless mini-split systems for single-zone and multi-zone applications with BTU recommendations.
Key Features:
- Multi-zone support
- Climate zones
- Diversity factors
- Equipment recommendations
CFM/Airflow Calculator
Calculate required CFM for ventilation based on room dimensions and air changes per hour requirements.
Residential Load Calculator
Calculate accurate heating and cooling loads for single-family homes, condos, and townhouses using Manual J methodology.
Key Features:
- Manual J compliant
- Single-family homes
- Condos & townhouses
- Instant results
Commercial Load Calculator
Professional load calculations for office buildings, retail spaces, and commercial facilities following ASHRAE standards.
Room-by-Room Calculator
Detailed room-level analysis for precise load distribution and zoning requirements in any building type.
Equipment Sizing Calculator
Size HVAC equipment based on calculated loads including furnaces, air conditioners, and heat pumps.
Geothermal HVAC Load Calculator
Specialized load calculations for geothermal HVAC systems including ground source heat pump sizing and loop requirements.
Key Features:
- Ground source heat pumps
- Loop field calculations
- Soil conditions
- High efficiency systems
Geothermal HVAC Cost Calculator
Estimate complete installation costs for geothermal HVAC systems including equipment, ground loops, and federal tax credits.
Key Features:
- Installation costs
- Federal tax credits
- Payback analysis
- Loop type comparison
Geothermal HVAC Sizing Calculator
Professional geothermal system sizing for ground source heat pumps based on building loads and site conditions.
Key Features:
- System sizing
- Ground loop design
- Performance optimization
- Site-specific analysis
HVAC Financing Calculator
Calculate monthly payments for HVAC financing. Estimate loan payments, total interest, and see how tax credits affect your financing.
Key Features:
- Monthly payment estimates
- Interest calculations
- Tax credit integration
- Payment comparison
SEER to SEER2 Converter
Convert between old SEER/HSPF/EER ratings and new SEER2/HSPF2/EER2 standards. Check if your system meets current regional requirements.
Key Features:
- SEER ↔ SEER2 conversion
- Regional compliance check
- Energy cost comparison
- Equipment type specific
Mini-Split Brand Selector
Compare top mini-split brands and get personalized recommendations based on your priorities, budget, and climate.
Key Features:
- 7 brand comparison
- Cold climate filtering
- Priority-based ranking
- Price & warranty analysis
HVAC Quote Analyzer
Compare multiple contractor quotes side-by-side. Detect red flags, verify pricing, and find the best value.
Key Features:
- Multi-quote comparison
- Red flag detection
- Value scoring
- Missing items checker
Heat Pump vs Furnace Calculator
Compare heat pump and gas furnace costs over 15 years. Get personalized recommendations based on your climate and energy rates.
Key Features:
- 15-year cost analysis
- Climate-based recommendations
- Dual-fuel options
- Regional rebate info
Why Choose Our HVAC Calculators?
Industry Standards
All calculations follow Manual J, ASHRAE, and local building code requirements for accurate results.
Instant Results
Get immediate load calculations and equipment recommendations without waiting for software processing.
Location-Specific
Calculations include design temperatures and climate data for all 50 states and major cities.
Not Sure Which Calculator to Use?
Start with our Load Calculation Basics guide to understand the fundamentals, or contact us for personalized recommendations based on your project requirements.