HVAC & Utilities Calculators

15 free calculators — HVAC systems, insulation, water heaters, ductwork, and humidifiers. IRA tax credit guidance included.

15 free calculators

Instant results

No sign-up required

Heating & Cooling Systems4 Ductwork & Insulation5 Water & Humidity Systems6

IRA tax credits for HVAC (2026)

Heat Pump (Air-Source)Must be 16+ SEER2 / 8.5 HSPF2

30%, up to $2,000

Heat Pump Water HeaterCombined $2,000 max with heat pump

30%, up to $2,000

Central AC (16+ SEER2)Energy Star certified

30%, up to $600

Gas Furnace (97+ AFUE)Northern climate requirement

30%, up to $600

Insulation & Air SealingMeets IECC standards

30%, up to $1,200

Annual credits — reduces tax owed, not a rebate. Claim each category up to the limit per year.

Heating & Cooling Systems

HVAC Installation Cost Calculator

Full HVAC installation by system type, home size, and SEER rating

$5,000–$12,500System type comparisonIRA tax credit

Furnace & AC Replacement Cost Calculator

Furnace and AC replacement with bundle savings and tax credit analysis

$3,000–$12,000Bundle 5-8% savingsHigh-efficiency credits

Central Air Installation Cost Calculator

Central AC by home size, SEER rating, and ductwork condition

$3,500–$8,000Tonnage calculatorSEER 16 tax credit

Mini Split Installation Cost Calculator

Ductless mini split costs by zone count, BTU, and brand tier

$2,000–$14,500Heat pump IRA creditMulti-zone savings

Ductwork & Insulation

Ductwork Installation Cost Calculator

New ductwork installation costs by home size and material

$2,000–$8,000Flex/sheet metal/fiberboardZone add-ons

Ductwork Replacement Cost Calculator

Ductwork replacement including removal and asbestos remediation

$3,000–$10,000Asbestos flagPartial vs full

Attic Insulation Cost Calculator

Attic insulation costs with payback period and IRA tax credit

$1,500–$5,500R-value guide$1,200 IRA credit

Attic Insulation Replacement Cost Calculator

Replacement including old insulation removal and remediation

$2,000–$7,000Removal costMold/pest remediation

Blown-In Insulation Cost Calculator

Blown-in costs by material and R-value target

$1,000–$4,000Cellulose/fiberglass/foamDepth calculator

Water & Humidity Systems

Water Heater Replacement Cost Calculator

Water heater replacement costs with IRA tax credit analysis

$600–$4,500Heat pump 30% creditTank vs tankless

Water Heater Installation Cost Calculator

New water heater installation with gas line and permit add-ons

$800–$5,000Gas line add-onPermit cost

Water Heater Maintenance Cost Calculator

Annual maintenance costs with 5-year projection

$100–$500/yrAnnual vs deferred5-year projection

Whole House Humidifier Installation Cost Calculator

Whole-house humidifier costs by type and home size

$400–$1,600Bypass/fan-powered/steamHome size guide

Humidifier Maintenance Cost Calculator

Annual humidifier maintenance with urgency assessment

$60–$350/yrUrgency color codePart-by-part

Reverse Osmosis Installation Cost Calculator

RO system installation with bottled water savings comparison

$250–$1,800vs bottled waterCost per gallon