Home Systems

Size an air purifier from room volume and target ACH, compare effective CADR with the adjusted need, and estimate how many units fit.

Size passive attic ventilation from floor area, balance intake and exhaust NFA, then convert product ratings into lengths or vent counts.

Calculate bathroom exhaust fan CFM from room dimensions and fixtures, account for tall ceilings, then compare fan classes and installation checks.

Match a ceiling fan to room area and height, then verify physical fit and airflow performance plus location safety and annual running cost.

Estimate dehumidifier capacity from room size and moisture conditions, then compare portable-unit tiers with drainage and energy needs.

Size an EV charger circuit from EVSE current and check breaker fit, panel capacity plus conductor ampacity and long-run voltage drop.

Calculate NEC-style box fill from conductors and fittings, then compare required volume with the marked box capacity and available margin.

Estimate dwelling electrical service demand from general and major loads, then compare the result with the entered rating and headroom target.

Estimate French drain stone, pipe, fabric, required fall, and material cost from trench dimensions, outlet choice, and order units.

Size generator running and starting wattage from a load inventory, with startup overlap and site-derating assumptions for equipment comparison.

Estimate heat pump operating savings and simple payback using fuel use and seasonal efficiency, with utility rates and backup heat included.

Estimate a home EV charger installation budget from circuit size and wire route with panel work, labor, permits and uncertainty included.

Estimate a range hood airflow target from cooking load and capture geometry, then screen a real hood for duct and makeup-air concerns.

Estimate how many solar panels fit one roof face after pitch, setbacks, keepouts, frame gaps, and orientation, then screen DC size and annual energy.

Estimate solar module count and DC array size from electricity use, sun hours, losses, available area, and optional inverter sizing.

Estimate rooftop solar cash payback from net cost and annual energy value, including tariff treatment plus degradation and maintenance assumptions.

Size a sump pump by combining peak inflow with total dynamic head, then compare manufacturer-rated capacity and check cycling risk at that duty point.

Calculate ideal tank capacity, partial liquid volume, headspace, and reserve allowance for rectangular or cylindrical geometry.

Size storage and tankless water heaters from peak-hour volume, overlapping fixture flow and temperature rise with reserve and install checks.

Size a home water softener from tested hardness, iron and softened-water demand with regeneration, salt-use and peak-flow checks.

Size a well pump at the required flow and total dynamic head, then screen well yield plus pipe velocity, tank drawdown and pump-curve fit.

Estimate a whole-house water filter class from peak fixture flow and pressure limits, with source-water and replacement timing checks.