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HEAT PUMPS & SMALL WIND

Start with the conditions.
Keep the limits visible.

Connect local design assumptions to exact heat-pump source points, or review a wind site’s resource and tower geometry. Save either scenario with your project when you choose.

Your site details and assumptions stay on this page until you save or export. Static reference files load by state and equipment ID; there is no address lookup, external resource request or automatic annual-energy forecast.

Climate planning assumptions

LOCAL CONDITIONS FIRST

Choose a reference, then your actual assumptions.

The EPA guide supplies historical program limits. Those are separate from an actual site-specific design temperature. You can enter your own documented condition below.

2019 edition, revised April 27, 2021. Source geography is retained, including historical county names. A missing or changed county is not silently mapped. These values are not current weather or a replacement for the appropriate local design reference.

Design temperature is your entered assumption.

The served-space heating load is not inferred from advertised BTUs, floor area or the appliance-energy planner. Actual room loads, cooling needs, distribution, defrost and installation conditions require separate assessment.

Build a condition-based comparison.

Enable JavaScript to change assumptions, load exact reference packets and save a scenario. Source explanations remain readable below.

OPTIONAL · LOCAL PROJECT RECORD

Keep the assumptions with your project.

Your projects

Saving is optional. Existing equipment, quantities, notes and other scenarios are preserved. JSON export includes your private inputs; printable briefs omit them unless you select personal details.

What the two screens can establish.

Heating at published source points.

A visitor-entered design heat loss and temperature difference define a hypothetical linear building heat-loss line. Compare it only with discrete equipment points, retaining maximum, rated or unspecified modes. No heat-pump performance curve is interpolated or extrapolated. A point margin is conditional arithmetic, not a sizing approval or a guarantee through defrost.

Source-point COP remains attached to its reported mode. It is not combined with a different capacity mode to invent electrical demand. Check actual matched indoor/outdoor models, design conditions, distribution and the manufacturer’s extended-performance/installation documentation.

Wind-site evidence and geometry.

DOE’s Tower section gives a 30 ft bottom-of-rotor clearance heuristic within 300 ft; its siting section refers to 30 ft above obstacles within 500 ft. Both radii are shown. Applying bottom-tip geometry to the 500 ft screen is an explicit conservative assumption here. These are guidance screens, not a regulation or site approval.

Different resource and hub heights remain unresolved; no wind-shear adjustment is assumed. A mean wind speed and nameplate watts do not supply an annual yield. Turbine curve, wind distribution, density, turbulence, electrical losses, structure, zoning and actual site assessment remain necessary.

Primary references and their dates.

  • EPA: design temperature limits

    County program limits and actual site load-design temperatures have different scopes.

    Reviewed 2026-11-07 · capture 2026-11-08T02:33:00.875577+00:00

  • EPA design-temperature limit reference ·2019 edition, revised2021-04-27

    Historical program reference rows, not current weather, climate forecasts or a substitute for site-specific design conditions.

    Reviewed 2026-11-07 · capture 2026-11-08T02:33:01.252314+00:00

  • DOE WINDExchange: Small Wind Guidebook

    Resource assessment and siting guidance; Tower and How do I choose the best site sections state300ft and500ft obstruction radii respectively. Neither is an installation approval.

    Reviewed 2026-11-07 · capture 2026-11-08T02:33:02.125378+00:00

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