HVACBase
Your Trusted HVAC Resource Since 2024
Professional HVAC Calculators, Sizing Guides & Unbiased Equipment Reviews
Make informed HVAC decisions with our 340+ expert guides, ACCA Manual J calculators, and real-world efficiency data. No affiliate links, no bias — just accurate information.
Quick Access Tools
Professional HVAC Calculators & Sizing Tools
Size your HVAC equipment correctly with our ACCA Manual J based calculators. Avoid oversizing, reduce energy costs, and ensure optimal comfort with professional-grade sizing tools.
AC BTU Calculator
Calculate exact cooling capacity for any room size. Factors in climate zone, insulation, windows, and heat sources.
AC Tonnage Calculator
Convert BTUs to tons and size central AC systems. Includes ductwork considerations and SEER ratings.
SEER2 Savings Calculator
Compare energy costs between different SEER2 ratings. Calculate ROI and payback period for upgrades.
Heat Pump Size Calculator
Size heat pumps for both heating and cooling. Includes cold climate considerations and backup heat.
Furnace Sizing Calculator
Calculate furnace BTU requirements. Factors in home size, insulation, climate zone, and heat loss.
Mini Split Sizing
Size ductless mini splits for single or multi-zone applications. Includes line set calculations.
All calculators updated for 2026 efficiency standards and include regional climate adjustments
Complete HVAC System Guides & Resources
Whether you're replacing equipment, troubleshooting problems, or comparing options, our comprehensive guides provide the technical details and real-world insights you need.
Air Conditioning Systems
Heating Systems
Energy Efficiency & Ratings
Indoor Air Quality
Quick HVAC Answers & Common Questions
Sizing Questions
Cost Questions
Efficiency Questions
Troubleshooting
Energy Usage
HVAC Brand Comparisons & Reviews
Value Brands
Mini Split Brands
Heat Pump Brands
Smart HVAC Technology & Controls
Optimize comfort and efficiency with smart thermostats, zoning systems, and advanced controls. Save 20-30% on energy costs with proper automation.
Smart Thermostats
Wi-Fi enabled thermostats with learning algorithms, remote control, and energy reports.
Zoning Systems
Control temperature independently in different areas for maximum comfort and efficiency.
Variable Speed Tech
Inverter and variable speed systems adjust output for optimal efficiency and comfort.
HVAC Resources & Tools
Buying Guides
Why HVAC Professionals & Homeowners Trust HVACBase
We provide accurate, unbiased HVAC information based on manufacturer data, industry standards, and real-world testing — no affiliate links or sponsored content.
Data-Driven Content
Every guide backed by AHRI certifications, DOE data, and ACCA Manual J calculations
100% Unbiased
No affiliate commissions, no sponsored content, no brand partnerships — just facts
Industry Standards
Following ASHRAE, ACCA, EPA, and ENERGY STAR guidelines in all recommendations
Always Current
Updated weekly with 2026 efficiency standards, tax credits, and equipment releases
Our Editorial Standards
Research Process
- Verify all specifications against AHRI Directory
- Cross-reference EPA ENERGY STAR databases
- Use ACCA Manual J for all sizing calculations
- Include regional climate zone variations
Independence Commitment
- No affiliate links or referral fees
- No manufacturer sponsorships
- Equal coverage of all major brands
- Transparent about limitations and assumptions
Start With Our Most Popular Calculator
Size your AC correctly and avoid the #1 HVAC mistake: oversizing. Our calculator uses ACCA Manual J methodology for accurate results.