Category-specific evidence and scores. This is not a universal company score.
Current official and ENERGY STAR records support an efficient inverter offering, but no sufficiently current controlled independent test of a representative Keystone window model was verified; affected recalled U-shaped models are treated as model-specific history.
Last verified 2026-08-20
Profile answer
Keystone is not currently ranked in Window Air Conditioner Companies with a score of 65.2 out of 100. Evidence coverage is 100% and confidence is high. This result is specific to that category's frozen rubric.
Rank not ranked | Score 65.2 | 100% coverage | High confidence
Current official and ENERGY STAR records support an efficient inverter offering, but no sufficiently current controlled independent test of a representative Keystone window model was verified; affected recalled U-shaped models are treated as model-specific history. [3]
Keystone was reviewed as a company-level window-AC candidate using the representative models KSTAW08INV. [3]
Keystone remains evaluated but unqualified because current controlled independent window-AC evidence did not meet the frozen gate. [3]
Criterion score breakdown
Criterion
Weight
Score
Real-world cooling and comfort
25%
16.5
Reliability, durability, and safety
15%
7.5
Efficiency and lifecycle value
15%
13.5
Noise, inverter, installation, and controls
20%
14.0
Warranty and support
8%
4.8
Portfolio breadth and independent testing depth
10%
4.0
Documentation and transparency
7%
4.9
Strengths
Keystone receives 4.5 of 5 for efficiency and lifecycle value under the frozen anchors. The rating uses the cited representative-model record (KSTAW08INV) and preserves model-specific limitations; no commercial relationship or manual ranking adjustment enters this input. [3]
Limitations
Keystone receives 2 of 5 for portfolio breadth and independent testing depth under the frozen anchors. The rating uses the cited representative-model record (KSTAW08INV) and preserves model-specific limitations; no commercial relationship or manual ranking adjustment enters this input. [3]
Capabilities
Keystone receives 3.5 of 5 for noise, inverter, installation, and controls under the frozen anchors. The rating uses the cited representative-model record (KSTAW08INV) and preserves model-specific limitations; no commercial relationship or manual ranking adjustment enters this input. [3]
Pricing
Keystone receives 4.5 of 5 for efficiency and lifecycle value under the frozen anchors. The rating uses the cited representative-model record (KSTAW08INV) and preserves model-specific limitations; no commercial relationship or manual ranking adjustment enters this input. [3]
Support and warranty
Keystone receives 3 of 5 for warranty and support under the frozen anchors. The rating uses the cited representative-model record (KSTAW08INV) and preserves model-specific limitations; no commercial relationship or manual ranking adjustment enters this input. [3]