Mini-Split Indoor Head Icing: Airflow, Load, and Refrigerant Boundaries
Diagnose ice on a mini-split indoor head by checking airflow, operating conditions and drainage before technician-only sensor and refrigerant measurements.
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Single-Stage vs Multi-Stage Thermostat Control: What Changes
Compare single-stage and multi-stage thermostat control, including terminals, staging logic, equipment-board timers, comfort effects and commissioning checks.
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Mini-Split Runs but Does Not Cool: A Measurement-Based Diagnosis
Trace a running mini-split that is not cooling by checking mode, air mixing, coil airflow, temperature response and technician-only refrigerant measurements.
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Total Duct Leakage vs Leakage to Outside: What Changes
Compare total duct leakage with leakage to outside, including the test boundaries, equipment required and why the two CFM25 values answer different questions.
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Mini-Split Short Cycling: Load, Control, and Installation Causes
Diagnose mini-split short cycling by separating low load and minimum capacity from sensor, airflow, refrigerant and control issues under measured conditions.
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CFM25 Explained: How Duct Leakage Results Are Compared
Understand what CFM25 represents, why floor-area normalization matters and which test conditions must match before two duct leakage results are compared.
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Thermostat Compressor Protection Delay: Why Cooling Waits to Start
Learn why a thermostat delays compressor restart, how to distinguish normal off-time protection from a lost call and when the outdoor unit needs diagnosis.
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Duct Blaster Test: Setup, Procedure, and Useful Results
See how a Duct Blaster test seals registers, controls duct pressure and measures leakage, including setup details needed for a defensible result.
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Thermostat Temperature Differential and Deadband Explained
Understand thermostat differential and deadband, including display rounding, sensor accuracy, staging and why a universal temperature swing does not fit every.
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Multi-Zone Mini-Split Sizing: Capacity, Diversity, and Head Selection
Size a multi-zone mini-split by checking room loads, connected capacity, diversity, minimum output and manufacturer combination tables at design conditions.