Whiteout Survival Furnace

Published: 2026-11-10

The Furnace is the main building of your city in Whiteout Survival: its level caps every other building and decides what you unlock next. Each Furnace level needs one or two other buildings at the level just below it, plus resources and build time. Level 30 is the last ordinary level, and after it the Furnace climbs through Fire Crystal levels FC1 to FC10, paid with Fire Crystals. Checked in November 2026.

Furnace Upgrade Requirements

Before the Upgrade button lights up, the window lists what the Furnace needs: one or two buildings at a set level, then the resources. Early levels ask for the building you just unlocked, such as the Sawmill for level 2 or the Coal Mine for level 4. From level 11 on, the rule settles into a loop: the Embassy one level below the target, plus a second building that rotates between the Infantry Camp, Marksman Camp, Lancer Camp and Research Center.

That loop is why a Furnace rush stalls: you are really upgrading five buildings in turn. Keep a builder on the Embassy at all times, and line up the next camp or the Research Center before the Furnace timer ends.

Furnace Levels 1 to 30: Costs and Build Time

The costs below are what the game asks for each level, and the times are base timers before Construction Speed and speedups. Levels 1 to 10 need only Wood, Coal and Iron; Meat joins the bill at level 11. From there every level costs clearly more than the last, and the Meat and Wood for levels 28 to 30 alone are more than for levels 1 to 27 together.

Where a cell shows two numbers, guides give different amounts for that level, and the upgrade window in your game shows the exact one. A dash means the amount is missing from the lists. Added up, the base timers from level 1 to level 30 come to about 215 days, which is why Construction Speed matters so much in the mid game.

What Each Furnace Level Unlocks

Most of the city opens in the first ten Furnace levels. After that, each new feature is tied to a specific level, and a few of them change how you play: the Drill Camp at 13, hero gear at 15, Chief Gear at 22 and Chief Charms at 25.

The Hunters' Hut is listed at level 1 in one table and at level 2 in another, so expect it in your first minutes either way. The buildings guide explains what each of these buildings does, and the Chief Charms guide covers the level 25 unlock in detail.

Troop Tiers and Camp Levels

The Furnace does not unlock troop tiers by itself. Each tier opens when you upgrade the matching camp, and a camp can never be higher than your Furnace, so the Furnace still sets your ceiling.

The three camps do not open at the same time: the Infantry Camp comes at Furnace 7, the Marksman Camp at 8 and the Lancer Camp at 9. The troops guide covers what each tier changes in battle.

The video walks through an early Furnace upgrade on a phone: tapping the Furnace, reading the list of new buildings and requirements, finishing the building it asks for and pressing Upgrade. It is about two minutes long.

Fire Crystal Furnace: FC1 to FC10

Furnace 30 is not the end. The next stage is the Fire Crystal Furnace, with ten levels from FC1 to FC10. Each level is split into 5 steps, so there are 50 upgrades in total, starting with steps 30-1 to 30-4 and ending with FC10. The first step needs Embassy and Research Center at level 30.

Every step still costs Meat, Wood, Coal and Iron, but the real limit is Fire Crystals. From FC6 on, each step also asks for Refined Fire Crystals, which are much rarer. The table adds up all five steps of each level.

The whole path from level 30 to FC10 costs 11,610 Fire Crystals and 870 Refined Fire Crystals, and the base timers add up to about 695 days. FC1 alone takes 660 Fire Crystals, while FC10 takes 1,575 plus 420 Refined Fire Crystals.

Where to Get Fire Crystals

Fire Crystals arrive in small amounts from many places, and the steady free one is the Crystal Laboratory.

• Exchange ordinary resources in the Crystal Laboratory.
• Defeat Beasts via Intel Missions
• Flame and Fangs event
• Get to the final 2 Stages in Daily Missions
• Intel Monthly Card
• Various Packs and State of Power

In the Crystal Laboratory each refinement costs the same amount of Meat, Wood, Coal and Iron, and the price climbs with every refinement you make that day:

The first refinements of the day are the cheapest, so doing a few every day beats doing many at once. One refinement returns between 1 and 5 Fire Crystals in the current version, and older guides describe a fixed single crystal. The resources guide shows where the Meat, Wood, Coal and Iron for the laboratory come from.

How to Upgrade the Furnace Faster

• Keep two builders busy. The Furnace and the building it needs next can run at the same time. Start the requirement while the Furnace is still upgrading.
• Use Double Time on long timers. It works on upgrades you start in the next five minutes, not on the one already running.
• Cave Hyena. This pet's skill raises Construction Speed for five minutes. Guides put the bonus between 5% and 15%. The pets guide covers how to level it.
• Research Construction Speed. The Growth tree of the Research Center raises build speed for every building. The research guide lists what to take first.
• Save speedups for the big levels. A 5-minute speedup barely moves a 20-day timer, but it can finish an early level outright. Spend general speedups on the Furnace and its requirements, not on side buildings.
• Join an active alliance. Alliance help cuts time off every upgrade, and an active alliance gives many more helps per timer. The alliance guide explains how help works.

Frequently Asked Questions

Read Next

See what every building in your city does in the buildings guide, plan your first week with the beginner guide, or check the Whiteout Survival calculator for Storehouse and resource numbers. The full list of guides is on the guides page.