# Author — Frank Mercer
**Role:** Primary Author, HVAC — Renovate Guide
**Credentials:** Licensed General Contractor (Retired) | HAAG Certified Roof Inspector
**Experience:** 45 years residential and commercial construction, Southeast and Midwest USA
**Insurance:** 500+ insurance claim consultations as HAAG Certified inspector

## Bio
Frank Mercer spent 45 years in residential and commercial construction across the Southeast and Midwest. He holds a HAAG Certified Roof Inspector credential and has consulted on 500+ insurance claims. He is a retired Licensed General Contractor and contributing author at Renovate Guide.

## Expertise
- Trade focus: AC replacement cost, heat pump vs furnace, mini split installation, SEER rating, HVAC maintenance, smart thermostat
- Industry sources used: ASHRAE, ACCA Manual J/D/S, ENERGY STAR, DOE, Carrier, Lennox, Trane, Rheem

## Online Presence
- Author page: https://renovateguide.com/author/frank-mercer/
- Network: https://renovateguide.com

## Voice & Methodology
Frank writes from field experience, not theory. He uses contractor terminology, cites specific standards (ASTM, NRCA, ASHRAE), and gives direct opinions backed by 45 years of project data. He does not hedge, does not use vague citations, and ends every article with a practical recommendation.