You deserve transparency, accuracy, and trust. This savings tool uses conservative screening assumptions informed by ASHRAE guidance, U.S. Department of Energy research, and other accepted third-party sources to estimate the value your facility may be quietly losing each year.
At Safe Air UV, we aim to communicate clearly, model conservatively, and serve as a true partner & subject-matter-expert.
Enter basic facility information for an instant, printable savings estimate.
No email, login, or personal information required.
Inputs
Defaults adjust schedules and typical HVAC intensity (editable in
Methodology).
Enter blended rate.
References NOAA nearest major airport for CDD65
Primary sizing input. Used to estimate total HVAC tonnage using
conservative
industry averages.
Multiplies all results (screening only). Assumes similar sites.
Climate data reference (applied to calculations)
Climate: —
CDD65: —
Cooling weeks (est.): —
Total tons (modeled): —
Financial Planning Inputs (Optional)
Used to estimate project cost, payback, and planning metrics. Does not affect calculated
operating savings.
If left blank, screening cost will be estimated automatically based on total
tonnage.
Optional annualized exposure based on replacement cost and risk %. Included in the
waterfall
total when enabled.
▾ O&M and optional budget exposure (editable assumptions)
Reported separately from energy for transparency.
Transparent UV ongoing costs (included)
▾ Advanced inputs (engineering controls)
Total tons = units × avg tons. Optional sqft override below.
Used only if sqft override is entered.
Screening average; varies by system and vintage.
Captures fan power across operating hours.
Defaults are conservative and explainable. If you have measured schedules or BAS trends,
adjust
here.
Annual Net Operating Cost Reduction (Calculated)
$0
Energy + O&M − UV operating/lamps.
Major repair risk reduction shown separately.
Energy savings: $0
O&M savings: $0
UV ongoing cost: $0
Cost of waiting
$0 / month
$0 / week (Calculated case)
Low / Calculated / High represent conservative, published, and fouled screening scenarios.
Value Composition (Calculated)
Shows how annual value is built. Incentives are one-time and shown if selected.
Financial Interpretation
Planning-level financial context based on calculated annual operating savings.
Simple payback
—
Based on energy and operating cost reduction with turn-key installation.
Effective payback
—
Includes incentives, Section 179, and repair reduction (if enabled).
10-year net operating value
$0
Before incentives & Section 179 tax benefits.
10-year all-in planning value
$0
Includes incentives, Section 179, and repair reduction (if enabled).
Estimated first cost
$0
Before incentives & Section 179 tax benefits.
SIMPLE INVESTMENT RATIO
—
10-year @ 4% discount rate.
Environmental Impact (Net Annual)
Net kWh savings and EPA greenhouse gas equivalencies based on screening-level results.
Net kWh Saved
0
Metric Tons of CO₂e
0
Tree Seedlings (10 yr)
0
EPA greenhouse gas equivalencies based on net kWh after UV energy.
Disclaimers
- This is a preliminary screening estimate, not an audit. Actual results depend on coil condition, equipment type, controls, runtime, and tariff structure.
- Energy savings are presented as a range (Low/Calculated/High). High values represent severe fouling scenarios and should be validated.
- O&M and “Major repair risk reduction” are shown separately for transparency and to avoid double-counting.
- No data is collected or sold by this static calculator. (Optional facility name is used only to label your printable report.)
Calculator v2.5.0 • Screening estimate
▾ Methodology & References (Screening-Level)
Energy savings mechanism (fan + cooling):
HVAC coil fouling impacts system performance in two distinct but related ways:
(1) Airside pressure drop (ΔP), which increases fan energy anytime the fan operates (cooling, heating, or circulation), and
(2) Heat-transfer degradation (ΔT), which increases compressor energy during active cooling operation.
This calculator models these effects separately and then combines them to estimate total energy recovery. Fan-related savings are applied across all modeled fan operating hours. Cooling-related savings are applied only during cooling hours. These effects are not double-counted; they represent different physical penalties caused by the same fouling condition.
HVAC coil fouling impacts system performance in two distinct but related ways:
(1) Airside pressure drop (ΔP), which increases fan energy anytime the fan operates (cooling, heating, or circulation), and
(2) Heat-transfer degradation (ΔT), which increases compressor energy during active cooling operation.
This calculator models these effects separately and then combines them to estimate total energy recovery. Fan-related savings are applied across all modeled fan operating hours. Cooling-related savings are applied only during cooling hours. These effects are not double-counted; they represent different physical penalties caused by the same fouling condition.
This is a budgetary screening estimate intended to be explainable. It combines:
(1) fan-related impacts (pressure drop/airflow) and (2) cooling impacts (coil heat-transfer
degradation).
Published field monitoring following UVGI coil irradiation has reported average improvements
on
the order of
~11% airside pressure drop and ~14.6% heat transfer
coefficient in a
hot-humid field case.
This calculator uses conservative bands tied to HVAC age and cleaning frequency to produce
Low/Calculated/High
outcomes.
Climate
Cooling degree days (CDD65) are sourced from NOAA NCEI 1991–2020 climate normals at
the
nearest qualifying airport station.
Cooling weeks are derived using CDD65 ÷ 70 (screening conversion).
Energy baseline
Cooling kWh ≈ tons × (kW/ton) × cooling hours × load factor. Fan kWh ≈
tons ×
(fan kW/ton)
× annual fan hours.
Savings bands
Recovery percentages are determined by HVAC age band and coil cleaning
frequency and are
applied independently to fan energy (ΔP recovery) and cooling energy (ΔT recovery)
before being combined
into total savings. High values represent severe fouling and should be validated via
inspection or
pressure-drop evidence.
O&M lines
Coil cleaning and filter strategy are shown separately for transparency
and
to avoid double
counting.
Major repair risk reduction
Optional: annualized budget exposure reduction = (replacement + major
repair)
/ life × risk
%. Not guaranteed savings.
Green metrics
Metric tons CO₂e = net kWh saved / 1412.1037. Tree seedlings grown for 10
years = net kWh
saved / 85.336. (Net kWh accounts for UV energy.)