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Mark Callahan
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Mark Callahan
How Long Do Furnaces Last? Reliability, Warranties & Replacement Signs
How Long Do Furnaces Last? Reliability, Warranties & Replacement Signs Mark Callahan – the expert installer A furnace is one of the longest-serving mechanical systems in a home, so it is understandable that homeowners want a simple answer to one…
How Much Does a New Furnace Cost in 2026? Equipment & Installation Costs Explained
How Much Does a New Furnace Cost in 2026? Equipment & Installation Costs Explained Mark Callahan – the expert installer Replacing a furnace is one of those home projects where the advertised equipment price can tell you surprisingly little about…
Dual-Fuel HVAC Systems: How a Heat Pump and Gas Furnace Work Together
Dual-Fuel HVAC Systems: How a Heat Pump and Gas Furnace Work Together Mark Callahan – the expert installer For homeowners who already like the dependable winter heating of a gas furnace but also want the efficiency and versatility of a…
Furnace + AC Compatibility: How to Properly Match a Heating and Cooling System
Furnace + AC Compatibility: How to Properly Match a Heating and Cooling System Mark Callahan – the expert installer Replacing a furnace or central air conditioner often looks straightforward. If the furnace still works, why not install a new outdoor…
Natural Gas vs Propane Furnaces: Cost, Efficiency & Installation Compared
Natural Gas vs Propane Furnaces: Cost, Efficiency & Installation Compared When homeowners compare natural gas and propane furnaces, the conversation often starts with fuel price. That matters, but it is only part of the decision. The better question is how…
ECM Furnace Blowers Explained: Efficiency, Comfort, Noise, Cost
ECM Furnace Blowers Explained: Efficiency, Comfort, Noise & Cost Mark Callahan – the expert installer When homeowners compare furnaces, they usually focus on AFUE, BTU capacity, furnace stages and brand. The blower motor receives much less attention, even though it…
Upflow vs Downflow vs Horizontal Furnaces: Which Configuration Do You Need?
Upflow vs Downflow vs Horizontal Furnaces: Which Configuration Do You Need? When homeowners shop for a new furnace, most of the attention naturally goes to AFUE efficiency, BTU capacity, single-stage versus two-stage operation, variable-speed blowers, warranties and brand reputation. Those…
What Size Furnace Do I Need? BTU Sizing Guide for Homeowners
What Size Furnace Do I Need? BTU Sizing Guide for Homeowners Buying a furnace that is “big enough” sounds simple. Measure the house, find a BTU chart, choose the corresponding furnace and move on. Unfortunately, residential furnace sizing does not…
Single-Stage vs Two-Stage vs Modulating Furnaces: What’s the Difference?
Single-Stage vs Two-Stage vs Modulating Furnaces: What’s the Difference? When homeowners compare gas furnaces, AFUE usually gets most of the attention. A 96% furnace sounds better than an 80% furnace, and a 98% model sounds better still. But efficiency is…
80% vs 90%+ AFUE Furnaces: Which Efficiency Level Is Right for Your Home?
80% vs 90%+ AFUE Furnaces: Which Efficiency Level Is Right for Your Home? When homeowners compare gas furnaces, one of the first numbers they notice is AFUE. An 80% AFUE furnace may sit beside models rated at 95%, 96%, 97%…