1. [Home](/) 2. Guides # Heating & cooling guides for homeowners Plain advice on filters, tune-ups, thermostats and keeping a furnace or air conditioner running through Ohio winters and summers. ## [Furnaces and winter heating in Southwest Ohio](/guides/furnace-guide/) Winters in Southwest Ohio are cold enough that a furnace works hard for months, and many homes here are old enough that the furnace is only part of the story. This guide explains how your system works, what to watch for, and which jobs belong to a professional. [Read the full guideHow gas furnaces work, the warning signs to watch for, filter basics, fall tune-ups, carbon monoxide safety, and when to repair or replace in Southwest Ohio.](/guides/furnace-guide/) [Furnace warning signs to take seriouslyShort cycling, strange noises, a yellow burner flame, rising bills, uneven heat, and CO alarms: what each furnace warning sign means and what to do next. 4 min read.](/guides/furnace-guide/furnace-warning-signs/)[Furnace filters: which one and how oftenMERV ratings explained, how often to change your furnace filter, what to do with pets and allergies, and why a higher-rated filter can restrict airflow. 3 min read.](/guides/furnace-guide/furnace-filters/)[Repair or replace an aging furnace?How to weigh repairing against replacing an older furnace: age, repair history, AFUE efficiency, safety, comfort, and questions to ask your contractor. 3 min read.](/guides/furnace-guide/repair-or-replace-furnace/) ## [Air conditioning through an Ohio summer](/guides/air-conditioning-guide/) Southwest Ohio summers are hot and sticky, and your air conditioner has to handle both. Here is how the system works, what keeps it healthy, and what to do when it struggles. [Read the full guideHow air conditioning works in humid Ohio summers: refrigerant basics, condenser care, spring tune-ups, sizing, SEER2, breakdowns and cooling upstairs rooms.](/guides/air-conditioning-guide/) [AC running but not cooling: common causesYour AC runs but the house stays warm. Common causes, from dirty filters and frozen coils to refrigerant leaks, and which checks are safe to do yourself. 4 min read.](/guides/air-conditioning-guide/ac-not-cooling/)[Why your upstairs is hotter than your downstairsHot bedrooms on the second floor often come from attic heat, ductwork or airflow, not a weak AC. Here is what causes it and the fixes worth considering. 4 min read.](/guides/air-conditioning-guide/upstairs-too-hot/)[SEER2 ratings explained simplySEER2 shows how efficiently an air conditioner or heat pump cools. Learn what the number means, where higher ratings pay off and how to compare systems. 4 min read.](/guides/air-conditioning-guide/seer-ratings-explained/) ## [Heat pumps, humidity and indoor air quality](/guides/heat-pumps-and-air-quality-guide/) How heat pumps heat and cool a home in Southwest Ohio, how they pair with a furnace, and how to manage humidity and air quality through the year. [Read the full guideHow heat pumps work in Southwest Ohio winters, when dual fuel makes sense, and how to handle dry winter air, summer humidity and indoor air quality in homes.](/guides/heat-pumps-and-air-quality-guide/) [Do Heat Pumps Work in Ohio Winters?Cold-climate heat pumps can heat Ohio homes through winter. Learn how efficiency changes with temperature, when backup heat runs, and how dual fuel works. 3 min read.](/guides/heat-pumps-and-air-quality-guide/heat-pumps-in-ohio/)[Dry Air in Winter: Humidifiers and What HelpsDry indoor air in winter causes static and dry skin. See healthy humidity ranges, how whole-home humidifiers work, and how to avoid window condensation. 3 min read.](/guides/heat-pumps-and-air-quality-guide/winter-dry-air/)[Indoor Air Quality Basics for HomeownersUnderstand household dust, allergens and ventilation, then compare furnace filters, air cleaners and UV lights and learn when to call an HVAC professional. 3 min read.](/guides/heat-pumps-and-air-quality-guide/home-air-quality-basics/) ## Call (513) 540-1716 or send a quote request and tell us what your system is doing. [Get a quote](/contact/) [Call (513) 540-1716](tel:+15135401716) --- **Fairfield-Hamilton Heating & Cooling** · 6660 Dixie Highway, Suite 302, Fairfield, OH 45014 · (513) 540-1716 · inbound@fairfieldhamiltonhvac.com [Get a quote](/contact/) · [Services](/services/) · [Guides](/guides/) · [FAQ](/faq/)