What is this appliance costing me?
Use appliance presets, local electricity rates and daily runtime.
Calculate electricity cost →ENERGY COSTHOME SYSTEMSPROJECT BUDGETS
Free calculators • Transparent assumptions • Location-based energy data
Know the cost before you call the contractor
Model energy bills, major home upgrades and installation costs with transparent calculators built for homeowners.
WattCostLab is a home energy, upgrade cost and climate resilience intelligence platform.
WATTCOSTLAB / BRAND
Home energy, cost and upgrade intelligence
WattCostLab combines transparent calculators, location-aware energy data, project-cost planning, climate-resilience tools and verified technology analysis for homeowners.
WattCostLab is the website and publication. The WattCostLab Editorial Team is the group responsible for editorial standards, source review and corrections.
Global context
Location and Currency
Choose the project location independently from the currency used for monetary inputs. Location controls supported defaults; currency stays independently selectable.
100+ practical pagesCalculators and decision guides
Editable assumptionsUse your own rates and project inputs
Primary-source preferenceEIA, DOE, NREL and technical documentation
No hidden quote formTools work before you share personal data
Core calculators
Electricity
Solar
HVAC
Projects
Start with the question you actually have
Will solar pay back?
Estimate savings, system size and simple payback before requesting quotes.
Estimate solar payback →Heat pump or gas furnace?
Compare simplified annual heating costs using your own utility prices.
Compare heating costs →Which contractor quote is stronger?
Compare scope, warranties, permits and exclusions side by side.
Compare quotes →
Decision engine
Find your highest-value home energy opportunity
Answer a few non-personal questions and WattCostLab will point you to the most useful calculator or guide.
High-intent project guides
LIVE PVGIS
Understand the expensive part before you buy
Solar PV by Location
Select a city or coordinates, load live PVGIS solar data, then estimate system size, annual output and payback.
Open location calculatorHeat Pump Installation Cost
Capacity, electrical work, backup heat, ductwork and commissioning.
Read guide →HVAC Replacement Cost
Compare equipment, ducts, controls and full installation scope.
Read guide →Solar Panel Installation Cost
Separate system hardware, electrical scope, permitting and add-ons.
Read guide →Home EV Charger Installation Cost
Circuit length, panel capacity, trenching and permits.
Read guide →200 Amp Panel Upgrade Cost
Panel replacement versus a complete electrical service upgrade.
Read guide →Heat Pump Water Heater Installation Cost
Electrical compatibility, drainage, location and operating-cost tradeoffs.
Read guide →
Appliance cost cluster
Turn everyday energy use into searchable answers
Plan a project
Build the budget before talking to contractors
Use the project planner to combine solar, battery, HVAC, electrical, EV charging, water heating and efficiency work into one budget.
Open Project Budget PlannerAlready have quotes?
Compare price, warranty, permits, electrical scope, commissioning and exclusions without uploading personal documents.
Compare up to 3 quotes
Trust & transparency
See the assumptions behind the answer
Methodology
How equations, defaults and examples are handled.
Read methodology →Sources & Data
Primary sources and reference datasets used by the site.
View sources →Editorial Policy
How content is reviewed and separated from commercial relationships.
Read policy →Funding & Disclosure
How advertising, affiliate or referral revenue may support the site.
Read disclosure →
Decision comparisons
Compare the options people actually choose between
Heat Pump vs Gas Furnace
Operating cost, cold-weather performance and installation scope.
Compare heating systems →Home Battery vs Generator
Runtime, power, fuel, noise, maintenance and solar integration.
Compare backup power →Tankless vs Heat Pump Water Heater
Efficiency, retrofit complexity, space and hot-water demand.
Compare water heaters →Home improvement costs
Plan expensive home projects with the same transparent math
WattCostLab now extends into adjacent home-improvement projects where homeowners need a realistic budget before contacting contractors.
Roof Replacement
Calculate roof cost →Siding Replacement
Calculate siding cost →Window Replacement
Calculate window cost →HVAC Replacement
Calculate HVAC cost →Visual inspection library
See red flags before you compare quotes
WattCostLab now pairs high-value cost guides with original visual comparisons showing observable project red flags and better-practice cues.
Roofing
Damaged shingles, flashing and drainage vs a cleaner finished roof.
See visual guides →HVAC & Heat Pumps
Airflow, clearance, mounting and service-line routing.
See HVAC guide →Electrical & EV
Panel condition, cable management and installation quality cues.
Explore visual library →
Climate Resilience
CLIMATE ADAPTATION
Climate Resilience
Adapt your home for heat, flooding, wildfire smoke, storms, power outages and water stress without pretending a simple score can predict property-level risk.
Assess your home →Adaptation guides
Climate Resilience & Home Adaptation
Use the guides below to understand practical measures, then return to the planner to build a location-specific budget.
Adaptation guides →
PURCHASE-STAGE TOOLS
Planning a real project?
Use quote-based project planners for solar, HVAC, EV charging, electrical work and resilience upgrades. WattCostLab keeps contractor pricing separate from sourced energy and solar references.
PROJECT COST PLANNERS
Build a project budget
Estimate cost and payback with your own quote assumptions, local energy references and PVGIS where relevant.
Explore project planners →CONTRACTOR QUOTES
Compare scope before price
Review equipment, electrical work, permits, exclusions, warranties and commissioning before comparing totals.
Compare quote scopes →New homeowner connection toolEstimate hookup cost
Estimate the cost to hook up electricity to a house
Model utility fees, distance, overhead or underground service, meter equipment, main panel work and site-specific allowances.
Electricity Hookup Cost Calculator
Use editable planning assumptions, then replace them with your utility and electrician quotes.
INNOVATION / VERIFIED SOURCES
SOLAR
MATERIALS
TECHNOLOGY RADAR
Innovation & Trends
Verified updates on higher-efficiency solar, new insulation materials, heat-pump storage, smart batteries and climate-resilient technology.
Tandem PV modules
Record efficiency, perovskite-silicon scale-up and new module architectures.
Next-generation solar →Advanced insulation & windows
Aerogels, active vacuum insulation and adaptive smart glazing.
Advanced materials →What could change home energy next?
Research, pilot, field demonstration and commercializing are kept separate.
Explore Innovation & Trends →
ELECTRICITY MARKET / OFFICIAL SOURCES
Find the cheaper electricity offer
Compare selected supplier plans by estimated annual cost, effective price, contract term and fees using official market sources.
Compare Electricity Suppliers
Romania · Italy · Portugal · Spain · France · USA
Europe plus Texas, Ohio, Pennsylvania and New York retail-choice workflows.
Compare suppliers →INTERACTIVE CHART
Annual cost at hover/tap
Rank the offer rows you provide and inspect exact annual cost, effective price, savings and contract conditions interactively.
Open global comparator →