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Theo Marlow

Theo Marlow is the editor of Side Margin, a site that answers practical questions about money, home, and tech with sourced, plain-English guides. Every article is researched with AI tools, then read, edited, and fact-checked by a human before it is published.

Heat Pump vs Furnace: 2026 Costs, Credits and the Math

September 23, 2026 by Theo Marlow
Heat pump vs furnace 2026 comparison

Heat pump vs furnace in 2026: running costs with EIA prices, cold climate field data, the 25C credit ending, and which system fits your fuel and climate.

Categories Home & Living

How to Prevent Frozen Pipes (and What to Do If They Burst)

September 23, 2026 by Theo Marlow
Checklist to prevent frozen pipes before winter

How to prevent frozen pipes before winter and on cold nights, thaw them safely, handle a burst pipe, and keep your homeowners insurance claim valid.

Categories Home & Living

How Often to Change Your Furnace Filter, by Filter Type

September 23, 2026 by Theo Marlow
How often to change furnace filter by filter thickness

How often to change furnace filter: 1-inch filters every 1 to 3 months, 4-inch media 6 to 12 months. Plus MERV ratings, sizing, arrows and yearly cost.

Categories Home & Living

Furnace Not Turning On? What to Check Before You Call

September 22, 2026 by Theo Marlow
Checklist for a furnace not turning on: thermostat, power, door panel, filter

Furnace not turning on? Check the thermostat, breaker, service switch, door panel, filter and blink code first, and know when to stop and call a pro.

Categories Home & Living

Water Heater Leaking? What to Do First and What It Costs

September 22, 2026 by Theo Marlow
Water heater leaking: first steps and what each leak means

Water heater leaking? Shut off power or gas and the cold supply, then find the source. Which leaks are cheap fixes, which mean a new tank, and costs.

Categories Home & Living

Disability Insurance at Work: The Tax Box That Matters

September 21, 2026 by Theo Marlow
Disability insurance at work: a pre-tax premium makes the benefit fully taxable

Pay the premium pre-tax and the benefit is taxable. SSA puts the risk at 1 in 4 and an initial decision takes 226 days. What to check now.

Categories Money

Special Enrollment Period: What Qualifies and the Proof Rule

September 21, 2026 by Theo Marlow
Special enrollment period: most windows run 60 days

What triggers a special enrollment period, how long you get, and the document deadline that quietly undoes enrolments in 2027.

Categories Money

Open Enrollment Checklist: What Is Worth Real Money

September 20, 2026 by Theo Marlow
Open enrollment checklist: the 30 day window after a qualifying life event

Half of people spend under an hour on a decision worth thousands. The 2027 limits, the 30 day rule, and the five minute items worth more than the health plan.

Categories Money

Deductible vs Out-of-Pocket Maximum: The Order Money Moves

September 20, 2026 by Theo Marlow
Deductible vs out-of-pocket maximum: a starting line and a finish line

Five words most people mix up, the order your money actually moves through them, and what never counts toward the maximum.

Categories Money

Surprise Medical Bills: What Is Covered, What Is Not

September 20, 2026 by Theo Marlow
Surprise medical bills: the No Surprises Act leaves out ground ambulance

Federal law covers emergency care and out of network providers at in network facilities. It does not cover ground ambulance, which is 85% out of network.

Categories Money
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