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Think your AC is the right size? Think again. This guide reveals 5 common sizing mistakes that spike your energy bills, shorten system life, and ruin comfort. Learn how to avoid guesswork by using Manual J, picking the right tonnage

Looking for a heat pump that actually performs when winter hits hard? This guide breaks down the best cold climate-ready heat pumps of 2025 — including models that maintain capacity below freezing, offer smart control, and qualify for rebates. Whether you're replacing an old system or electrifying your home, these are the top picks to consider.

Your home’s layout plays a bigger role in HVAC sizing than you might think. From tall ceilings to drafty windows, even small design details can throw off your system’s efficiency. In this guide, Alex Lane breaks down how to account for ceiling height, insulation quality, and window placement — and why skipping these factors can lead to oversized units, uneven comfort, and higher bills.

Heat pumps and furnaces aren’t sized the same — and using the wrong method can cost you in comfort, efficiency, and system lifespan. In this guide, Alex Lane explains how heating and cooling loads differ, when backup heat is needed, and why region, equipment type, and Manual J calculations all matter when comparing systems.

Climate matters, big time, when sizing HVAC systems. This guide explains how regional weather impacts BTU needs, why Manual J is better than rules of thumb, and how to apply zone multipliers for precise heating and cooling loads.

Sizing a mini-split isn’t about guesswork, it’s about precision. This room-by-room guide walks you through how to calculate the correct BTUs based on square footage, ceiling height, windows, insulation, and room use.

SEER2 is the new AC efficiency standard, and it tells the real story of how your system performs under everyday conditions. This guide explains what SEER2 means, how it affects your power bills, and why sizing and installation matter more than ever.

Oversized A/C units short-cycle and leave moisture behind, undersized ones just can’t keep up. This advanced tonnage calculator guide walks HVAC pros and savvy homeowners through precise load calculations using BTUs, climate zone data, insulation, and window gains.

Living in a hot-humid zone like the Gulf Coast means battling intense heat and high humidity. This guide walks you through smart HVAC choices for Climate Zone 1A, from properly sized variable-speed systems and ducted dehumidifiers to corrosion-resistant outdoor units and balanced ventilation.

A 2,400 sq. ft. home typically needs a 4-ton AC, but factors like insulation, windows, and ceiling height can shift your real load. This detailed guide explains how to calculate the correct BTUs and tonnage using rules of thumb, Manual J, and lifestyle adjustments.

Upgrades like ENERGY-STAR windows and R‑49 attic insulation can shrink your home’s heating and cooling load, making your current HVAC system oversized. This detailed guide explains why a Manual J load recalculation is crucial after retrofits, how to gather the right data, and what to look for in the report. 

If you’re shopping for a new air conditioner, you’ve probably come across Lennox—a brand known for energy efficiency and quiet operation. But is Lennox really a good AC unit? In this guide, I’ll share what makes Lennox stand out, what to watch out for, and how it compares to other top HVAC brands. Whether you’re curious about Lennox air conditioner reviews or wondering if it’s the right fit for your home, I’ve got you covered.