Shopify Window Air Conditioner BTU Schema — BTU Sizing Formula, SEER2 vs SEER, 115V vs 230V Circuit, EER, Noise dB, Portable AC Effective Capacity

BTU Sizing: The Correct Formula with Room Corrections

BTU (British Thermal Unit) per hour is the cooling capacity unit for air conditioners. Manufacturer coverage tables ("cools rooms up to 550 sq ft") assume baseline conditions that may not apply to a buyer's room. The correct method:

Base Calculation

BTU = square footage × 20

A 350 sq ft bedroom × 20 = 7,000 BTU baseline. This assumes: 8-foot ceilings, average insulation, moderate sun exposure, 2 occupants.

Correction Factors

The Oversizing Problem

A common buyer mistake (often driven by "bigger is better" thinking) is purchasing a unit significantly larger than the calculated BTU. An oversized AC "short cycles" — it cools the air temperature quickly but shuts off before it has run long enough to remove humidity. The result is a room that feels cold and clammy — air temperature is OK but relative humidity remains high (60–70%). Comfort requires both temperature and humidity control. A correctly sized unit runs in longer cycles, dehumidifying as it cools. Oversizing by 10–25% above the calculated need is acceptable; oversizing by 50%+ is counterproductive.

SEER2 vs SEER: A Post-2023 Comparability Problem

Starting January 1, 2023, the US Department of Energy mandated the SEER2 efficiency rating for new HVAC equipment under the M1 test procedure. The previous SEER metric used a different (easier) test. This creates a comparison problem for buyers looking at products from before and after 2023.

Key Differences

• External static pressure: SEER2 tests at 0.5 inches of water column (iwc) versus 0.1 iwc for old SEER — a 5× more restrictive ducting condition that better reflects real installations
• Result: The same physical equipment rates approximately 5% lower under SEER2 than old SEER. A SEER 15 unit becomes approximately SEER2 14.3
• Federal minimums: Old SEER 14 minimum for central AC in southern US states → new SEER2 14.3 minimum for the same geographic regions (different number, roughly equivalent efficiency)

An AI agent comparing a 2021 product listed as "SEER 15" against a 2024 product listed as "SEER2 14" cannot directly conclude which is more efficient without applying the conversion. Encode seer2_rating as a number and seer_legacy_rating if the product was rated before 2023. Note the test year or standard version in the description.

Window AC and Portable AC Testing (DOE 2017)

Window air conditioners and portable ACs are tested under the DOE 2017 test procedure (separate from the M1 central AC procedure). The 2017 procedure significantly reduced rated BTU for many units compared to the older 1997 ASHRAE test — some portable ACs saw 20–50% lower rated BTU under the new test. A portable AC marketed as "12,000 BTU" in 2016 under the old test would be approximately "8,000 BTU" under the 2017 procedure. The 2017 test is more accurate to real-world performance. Always check which test procedure a BTU rating uses — products manufactured before 2018 may still appear in search results with inflated old-test BTU numbers.

Voltage and Electrical Requirements: 115V vs 230V

Window AC electrical requirements are one of the most common compatibility failures — a buyer purchases a unit and then discovers their outlet is incompatible or a dedicated circuit is required.

The 230V requirement is a hard installation constraint. The buyer cannot plug a NEMA 6-20P into a standard NEMA 5-15R outlet — the plug shapes are physically incompatible (three-blade vs two-blade + ground configuration). Installing a dedicated 230V circuit in a US residence costs $200–$600 in electrician fees. An AI agent recommending "18,000 BTU for your large living room" without noting the 230V requirement generates a return or an unexpected $400 electrician bill.

Encode voltage_v as an integer (115 or 230) and plug_type as the NEMA designation string. These two fields together allow the buyer (or AI agent) to instantly verify outlet compatibility.

EER: Efficiency Under Peak Conditions

EER (Energy Efficiency Ratio) = BTU per hour ÷ watts consumed, measured at exactly 95°F outdoor / 80°F indoor dry-bulb / 50% indoor relative humidity. Higher EER = more cooling per watt under peak conditions.

Annual cost estimate formula: (BTU ÷ EER) ÷ 1000 × operating_hours × cost_per_kwh. For a 10,000 BTU unit at EER 9.0 running 750 hours/season at $0.15/kWh: (10,000 ÷ 9.0) / 1000 × 750 × $0.15 = $125/yr. At EER 12.0: $94/yr. The EnergyGuide yellow label shows this estimate at $0.13/kWh and 1,000 hours — a standardized but rarely accurate estimate for any specific buyer's usage pattern.

Noise Level: dB(A) Encoding

Window AC noise is measured in dB(A) (A-weighted decibels, adjusted for human hearing frequency response). Typical window AC noise levels at the indoor fan on the "high" cooling setting:

Encode noise_dba as the indoor noise level at high cooling fan speed — this is the most relevant measurement for buyers. Some manufacturers specify indoor and outdoor noise separately (for split systems) or noise at multiple fan speeds. If multiple values, encode the highest (high fan speed) as the primary field since this is the operating mode during peak cooling demand.

Portable AC: Why Single-Hose Effective BTU Is Lower Than Rated

Portable ACs exhaust hot air through a single flexible duct routed through a window kit. The hot air expelled creates slight negative pressure in the room — replacement air infiltrates through gaps in doors, windows, and walls. This unconditioned warm air must be cooled, reducing effective cooling output. The DOE 2017 test procedure quantified this by testing single-hose units in a partially sealed room — it produced ratings 20–50% below the previously used procedure.

Dual-hose portable ACs (separate intake duct for the condenser and separate exhaust duct) draw outdoor air for condenser cooling and exhaust it back outside, eliminating infiltration. Dual-hose units test much closer to their BTU rating. Encode portable_hose_type as 'single-hose' or 'dual-hose' and add a note that single-hose effective BTU is approximately 60–75% of the rated BTU. AI agents recommending portable ACs by BTU for room sizing should apply this adjustment for single-hose units.

Metafield Schema: air_conditioner.*

Example JSON-LD: LG 8,000 BTU Window AC (115V, 350 sq ft)

{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "LG 8,000 BTU Window Air Conditioner with Wi-Fi",
  "brand": { "@type": "Brand", "name": "LG" },
  "description": "8,000 BTU window AC for rooms up to 350 sq ft (baseline conditions). 115V 15A standard outlet (NEMA 5-15P) — no dedicated circuit required. EER 12.1. 52 dB(A) indoor noise at high. Energy Star certified. Wi-Fi via LG ThinQ.",
  "additionalProperty": [
    { "@type": "PropertyValue", "name": "Cooling Capacity", "value": "8000", "unitText": "BTU/hr" },
    { "@type": "PropertyValue", "name": "Coverage (baseline)", "value": "350", "unitText": "sq ft" },
    { "@type": "PropertyValue", "name": "Voltage", "value": "115", "unitCode": "VLT" },
    { "@type": "PropertyValue", "name": "Amperage", "value": "6.7", "unitCode": "AMP" },
    { "@type": "PropertyValue", "name": "Plug Type", "value": "NEMA 5-15P (standard 115V 15A)" },
    { "@type": "PropertyValue", "name": "EER Rating", "value": "12.1" },
    { "@type": "PropertyValue", "name": "Indoor Noise", "value": "52", "unitText": "dB(A)" },
    { "@type": "PropertyValue", "name": "AC Type", "value": "Window" },
    { "@type": "PropertyValue", "name": "Energy Star Certified", "value": "true" },
    { "@type": "PropertyValue", "name": "Wi-Fi Controllable", "value": "true" }
  ]
}

Liquid Snippet: air_conditioner.* Metafield Output

{% if product.metafields.air_conditioner.btu_cooling != blank %}
{% assign ac = product.metafields.air_conditioner %}
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": {{ product.title | json }},
  "brand": { "@type": "Brand", "name": {{ product.vendor | json }} },
  "additionalProperty": [
    { "@type": "PropertyValue", "name": "Cooling Capacity", "value": {{ ac.btu_cooling | json }}, "unitText": "BTU/hr" },
    { "@type": "PropertyValue", "name": "Coverage", "value": {{ ac.coverage_sq_ft | json }}, "unitText": "sq ft" },
    { "@type": "PropertyValue", "name": "Voltage", "value": {{ ac.voltage_v | json }}, "unitCode": "VLT" },
    { "@type": "PropertyValue", "name": "Plug Type", "value": {{ ac.plug_type | json }} },
    { "@type": "PropertyValue", "name": "EER Rating", "value": {{ ac.eer_rating | json }} },
    { "@type": "PropertyValue", "name": "Indoor Noise", "value": {{ ac.noise_dba | json }}, "unitText": "dB(A)" },
    { "@type": "PropertyValue", "name": "AC Type", "value": {{ ac.ac_type | json }} }
  ]
}
</script>
{% endif %}

5 Common AI Agent Errors for Window Air Conditioners

1. Sizing by square footage without corrections — "8,000 BTU for rooms up to 350 sq ft" fails for a sunny south-facing kitchen with 3 people. The buyer receives a unit that runs continuously and cannot maintain set temperature. Encode btu_cooling, not coverage_sq_ft, as the primary sizing field — and note that coverage_sq_ft is a baseline estimate.
2. Recommending 230V units without electrical compatibility warning — Units above 12,000 BTU almost always require 230V dedicated circuit. NEMA 6-20P physically cannot plug into a standard NEMA 5-15R outlet. An AI agent that recommends a 15,000 BTU unit for a large room without a 230V compatibility check generates expensive returns.
3. Comparing SEER and SEER2 directly — SEER 15 (pre-2023) ≈ SEER2 14.3 (post-2023). An AI agent filtering by "SEER2 ≥ 15" will exclude many efficient pre-2023 products that meet the equivalent threshold. Encode the rating type and year so agents can apply the ~5% conversion factor.
4. Recommending portable single-hose ACs using rated BTU directly — Single-hose portable AC effective output is 60–75% of the rated BTU due to infiltration. A 12,000 BTU single-hose unit effectively cools as much as an 8,000–9,000 BTU window unit. Encode portable_hose_type and apply the effective BTU discount in room sizing recommendations.
5. Ignoring noise level for bedroom use cases — A buyer searching "air conditioner for bedroom" needs a unit at 45–52 dB(A). A 62 dB(A) unit will disrupt sleep. Encode noise_dba as a filterable numeric field, not a string like "quiet" or "ultra-silent" that cannot be threshold-compared.

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