2 cards
Controlled baseline matching comparing indoor heat retention before vs. after triple-pane window upgrade.
Indoor Temperature vs Outdoor Balcony Temperature (2024)
Baseline Renovation DeltaPost-renovation heat decay response during winter months.
Outdoor Match Envelope:
±0.5°C
Criteria:
Matched Days
60 / 60 days
Identical weather baselines
Indoor Temp Delta (ΔT)
+1.59°C
95% CI: [1.34, 1.84°C]
Significance (t-test)
< 0.001
t = 12.48 (p < 0.05)
Energy Retention
9.1%
Relative heat retention index
Paired Baseline Comparison Across Matched Weather Days
Pre-Renovation (2023) Post-Renovation (2024)
2026-07-27
Outdoor: 2.6°C
19.5°C
21.3°C
+1.75°C
2026-07-28
Outdoor: 4.7°C
20.2°C
21.5°C
+1.31°C
2026-07-29
Outdoor: 6.5°C
21.1°C
21.6°C
+0.48°C
2026-07-30
Outdoor: 7.9°C
21.9°C
21.8°C
+-0.04°C
2026-07-31
Outdoor: 6.7°C
21.3°C
21.8°C
+0.55°C
2026-08-01
Outdoor: 6.9°C
21.1°C
22.0°C
+0.90°C
2026-08-02
Outdoor: 6.5°C
21.1°C
21.9°C
+0.76°C
2026-08-03
Outdoor: 5.7°C
21.0°C
21.5°C
+0.50°C
+ 52 more matched day pairs within ±0.5°C outdoor envelope
Baseline Renovation Assessment: Controlling for matched outdoor weather profiles (tolerance ±0.5°C),
renovated conditions maintained an average of +1.59°C higher indoor temperature (statistically significant, p < 0.001).
Indoor temperature drops 62% slower when outdoor temperatures plunge below 0°C compared to 2023 baseline.
Pre-Renovation Thermal Baseline Scatter & Trendline (2023)
Cross-Source CorrelationCorrelation of outdoor vs indoor thermal gradient with single-pane windows.
Steeper slope (m = 0.64) in 2023 indicates high thermal transmittance before window replacement.