HVAC (Heating, Ventilation, Air Conditioning)

Radiant Heat In-Slab Tubing: Insulation, Layout, and Flooring Decisions

Radiant floor heating circulates warm water through tubing embedded in concrete, and the first design question is where to install the heat source: in the main slab or in a thinner topping slab poured over it. The answer changes the insulation, the tubing layout, and the flooring you can use. This article covers the decisions […]

Geothermal Heating and Cooling Systems for Homes: How They Work and What They Cost

Geothermal heating and cooling, also called ground-source heat pumping, uses the steady temperature of the earth to warm and cool buildings. A geothermal system moves heat between a house and the ground through buried pipes, replacing both a furnace and an air conditioner with a single machine. While conventional equipment burns fuel or rejects heat

Air Conditioner Sizing and Maintenance: Keeping Job Sites and Homes Cool

In July 2014, a crew drove to an on-site job in rural Oklahoma in a work truck with a dead air conditioner. The site sat at the end of a long carry-in path littered with stumps and brush, the afternoon temperature climbed, and by mid-afternoon the crew packed up and drove home, planning to finish

How to Cut Heating and Cooling Costs Without Sacrificing Comfort

Space heating and cooling are the largest single line item on a typical home energy bill, and that makes them the best place to look for savings. The U.S. Energy Information Administration estimates that space heating and air conditioning together account for roughly half of residential energy use, so even small percentage gains show up

How to Shut Off and Drain an HVAC Water Supply for Winter

High-velocity mini-duct cooling systems, hydronic coils, and whole-home humidifiers share a winter vulnerability: a water supply that was never meant to sit full of water at freezing temperatures. One hard freeze can split a coil, crack a supply line, or flood a mechanical room, and the repair bill lands in the thousands. The pattern is

Heating Large Buildings: System Selection, Sizing, and Efficiency

Heating a 50,000-square-foot building is a different problem from heating a house, and the difference shows up in every major decision: plant size, distribution temperature, zoning logic, and the staff needed to keep the system running. A home might cycle a single furnace, while a large building typically depends on a central plant with boilers

How High-Efficiency Gas Fireplaces Work: Efficiency, Venting, and Condensate

A high-efficiency gas fireplace does more than dress up a living room. Condensing models pull extra heat from the exhaust stream, push annual fuel utilization efficiency into the 80s and low 90s, and heat a space with a fraction of the gas an open-fronted firebox burns. That efficiency carries a trade: the flue gas cools

Is Your Home Central Air Conditioning Ready?

Central air conditioning is one of the most requested upgrades in existing homes, yet many owners discover partway through that their house was never set up for it. The gap between a working furnace and a condenser that fits is full of ductwork, electrical, and clearance questions that are cheaper to answer before installation starts.

How to Install a Programmable Thermostat: Wiring, Mounting, and Scheduling

A programmable thermostat pays for itself within the first heating season when it is installed correctly. The unit itself is inexpensive, the wiring is low voltage, and the whole swap takes most homeowners under an hour. Homeowners who take on detailed projects such as installing tile murals in shower walls often find the thermostat change

High-Efficiency Condensing Boilers: How They Work and How to Install Them

Condensing boilers have become the standard choice for new hydronic heating systems, and the reason shows up on monthly utility bills. A conventional boiler turns roughly 80 to 85 percent of the fuel it burns into usable heat. A condensing unit routinely clears 90 percent and often reaches 95 percent. Over a heating season, that